My Periods Are Irregular How Can I Calculate Ovulation

Calculate Your Fertile Window

My periods are irregular. So how do I know when I’m ovulating?

To calculate your Fertile Window, you need to determine what day you ovulate.To do this, you need to know the length of your menstrual cycle . To calculate this you should note how many days have passed from the first day of bleeding in your last period, to the first day of bleeding in your next.From this figure, subtract 14 days from the end of your current cycle to determine the day you ovulate.If you have irregular menstrual cycles, or your cycle length varies from month to month, it will be difficult to calculate your ovulation date. Ovulation urine tests may be useful, and you should consider seeking further advice from your GP or a Fertility Specialist.

How Do You Estimate Baby Due Date Using Conception Date Calculator

If you are keeping a track on your ovulation and know the fertilization date, you can estimate the due date based on the date of conception. The estimated due date, in this case, will be 38 weeks from the date of conception. Only a few women can accurately track the ovulation days and can guess when they have conceived. But, the calculations can go wrong as you may not conceive on the same day of the intercourse. The sperm can live up to five days, and the ovum for up to 24 hours after being released. In short, there is only a six-day fertile window where you can get pregnant.

In cases of in-vitro fertilization, the date of conception would be precise.

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How To Calculate Ovulation For Irregular Periods

So many people find it cumbersome to manually track or calculate ovulation with irregular periods. Ovulation predictor kits and fertility monitors are tools that do the tracking or calculation for you.

Unfortunately, with irregular periods, particularly those that are longer, you will probably have to do more testing month to month.

The Luteinizing Hormone is consistently detected in your urine. There is an increase in presence 24 to 48 hours prior to ovulation.

NOTE: In women, LH helps control the menstrual cycle. It also triggers the release of an egg from the ovary. This is known as ovulation.

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An ovulation predictor kit detects this increase and lets you know that you are ovulating. As ovulation predictor kits help you identify and confirm when you are ovulating, you should record these dates on your dairy or calendar.

Whether you look for patterns on the calendar or not, the information will be helpful to a fertility specialist or doctor if you find yourself encountering problems when trying to conceive.

Other ways to calculate your ovulation for irregular periods are

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Could My Due Date Change

The actual date the sperm and egg join is almost never known for sure. Your provider will likely recommend that you have an ultrasound once or twice in the first half of your pregnancy to make sure your due date is correct. The ultrasound can measure the size of your baby and use that information to figure out your due date. Your provider will likely recommend you have an ultrasound during your first trimester if you are not sure of the day your last period started, you had spotting or an abnormal period, you have irregular periods, or your providers findings on your exam do not match the due date based on your last menstrual period. The due date based on a first trimester ultrasound is usually the most accurate . The ultrasound due date will be used if there is more than a week or so difference between the due date based on the ultrasound and the due date based on your period.

  • What information about my due date is the best?
  • What information is causing my due date to change?
  • How will this change affect my care, now or later?

How Far Along Am I

How to Calculate Your Ovulation Period Using Your ...

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The How Far Along Am I Calculator uses your due date or last menstrual period to calculate how many weeks, months, and days you are pregnant.

different starting dates to count pregnancy

  • Conception or ovulation
  • Measurements from an ultrasound
  • IVF Transfer date

Pregnancy is most commonly measured gestationally from a womans last menstrual period to birth. This period is known as gestational aging.

If you require more options to calcuate yourdue date or how far along you are, try ourdue date calulator.

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The Causes Of Irregular Periods You May Be Overlooking

One of the main causes of an irregular period is Polycystic Ovary Syndrome . PCOS is an imbalance in the hormones controlling the reproductive system. PCOS causes irregular ovulation, cysts on ovaries, bleeding, and infertility. Research shows PCOS cases double miscarraiges and premature deliveries.

What Is An Ovulation Calculator And How Does It Help You Get Pregnant

An ovulation calculator helps you to predict when your most fertile day will be for the best chances of conception. It can also help people to monitor their signs of ovulation, so theyll be able to recognise at what point in the cycle theyre in.

Some people find it reassuring to monitor signs of ovulation and feel confident they are taking control over boosting their fertility. Dr Matthew Prior, fertility consultant and medical director at Dr Fertility says, However, some research shows that getting too hung up on your cycle can cause more stress and take away the enjoyment of trying to conceive causing unnecessary pressure. If this is the case it may be a good idea to stop monitoring for a few months.

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How Does My Provider Decide My Due Date

The first due date that your provider tells you is usually based on your last menstrual period and the size of your uterus at your first visit. The time of conception is usually 2 weeks after your last normal period. Most babies are born about 40 weeks after your last menstrual period. This means time from conception until your due date is about 38 weeks. Most babies grow at the same rate early in pregnancy so the size of your uterus at your first visit can help your provider estimate your due date.

Irregular Periods And Pregnancy


Its not uncommon for women to have menstrual cycles that vary in length. One month it might be 28 days which is considered average and the next month it could be 31 days, and the next 27. Thats normal.

Menstrual cycles are considered irregular when they fall outside the normal range. The Office on Womens Health reports that an irregular menstrual cycle is one thats shorter than 21 days or longer than 35.

When counting the days in your cycle, the first day of bleeding is day one, and the last day of the cycle is the first day of bleeding in your next cycle.

Its possible to become pregnant when you have an irregular menstrual cycle, but you may find it difficult. If youre unsure about the length of your cycle from month to month, it can be difficult to know when youre ovulating.

Timing intercourse around ovulation can increase your chances for pregnancy since youll need to have sex during your fertile window to conceive. Your fertile window refers to a few days before ovulation and the day you ovulate.

An irregular menstrual cycle may also be a sign of irregular ovulation. You may not ovulate every month or you may ovulate at different times from month to month.

Read on to learn more about irregular periods and pregnancy.

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What Is An Ovulation Calculator

Ovulation calculator has been a boon for the couples who are trying so very hard to have a baby. This calculator does not actually help in the process of conception of a baby.

Ovulation calendar accurately determines the ovulation date. This is the fertile window in which the probability of conceiving a baby is the highest.

An important thing here is that your egg lives for only 24 hours after ovulation. But sperms can survive in your vagina for about 5 days. So your fertile window starts around 3 days before ovulation day.

If you have sex three days before ovulation you can have a baby. This holds true for every day up to one day after ovulation.

Ovulation calculator helps find out fertility days online. This fertile window period is easily predictable by taking some details about you.

You will have to fill your period date in the box of ovulation calculator.

Ovulation Cycles And Why They Can Be Confusing

Learn how to calculate ovulation based on the length of your menstrual cycle.

If youre trying for a baby, youve probably learned two important facts about conception: 1) a woman is most likely to conceive around ovulation and 2) pinpointing the date of ovulation isnt easy. Thats because ovulation doesnt always happen like clockwork, especially if you dont have a standard 28-day menstrual cycle. Heres everything you need to know about ovulation cycles, with tips on figuring out your moments of peak fertility.

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Knowing When Ovulation Occurs Is Essential For Those Trying To Get Pregnant

Charting Your Cycle Even though your cycle is irregular, it is good to track it on a calendar for a few reasons. First, you may notice some clues that give you a pattern. Second, if you experience fertility problems, the data from your tracking efforts is valuable information to share with your gynecologist or fertility specialist.

Cervical Mucus Your cervical mucus changes when you ovulate. Cervical mucus during the first few days after your menstrual cycle will be dry. Your cervical mucus will begin to increase. As you approach ovulation, the cervical mucus will be plentiful, slippery, clear, and stretchy. Many women compare the consistency to that of egg whites.

Basal Body Temperatures Your body temperature fluctuates with the onset of ovulation. If you are tracking your basal body temperature, you will find a spike in temperature as ovulation occurs. This lets you know that ovulation is occurring.

When To Try To Get Pregnant

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Trying to conceive? No one needs to tell you how to do it , but you might need a little help figuring out when is the best time to have sex to get pregnant.

The short answer: The best time to conceive is around the time you ovulate. That prime “getting pregnant” window can include anywhere from a few days before ovulation because sperm can live to fertilize for three to six days until about a day after the release of the egg, which is only viable for about 12 to 24 hours.

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Consult A Health Care Provider

Lifestyle changes can sometimes help improve the chances of conceiving, but they cant replace medical treatment for underlying conditions. A health care provider can determine the cause of irregular cycles that may be making conception difficult.

A health care provider will probably perform a physical examination and ultrasound, and may order laboratory tests to measure hormonal levels. This will give them the necessary information to diagnose any health conditions that might be causing irregular cycles.

Theyll also ask about menstruation and look for symptoms of anovulatory cycles .

Once they have determined a diagnosis, a health care provider may be able to prescribe treatment. They may also be able to advise on how to get pregnant fast with irregular periods naturally or make a referral for a fertility specialist.

How To Know When Youre Ovulating

Knowing when you ovulate can help you plan for sex at the right time and improve your chance of getting pregnant. You can keep track of your menstrual cycles on a chart, in a diary, or on a free period-tracker app on your smartphone.

To work out the length of your menstrual cycle, record the first day you start bleeding . This is day 1. The last day of your cycle is the day before your next period begins.

  • Some people think the menstrual cycle and a period are the same thing.

    A period is when you bleed .

    A menstrual cycle starts on the day when a period starts and ends the day before the next period. A cycles length is considered normal if its between 21 and 35 days. They can vary between women and from one cycle to the next.

  • Working out your average menstrual cycle length

    If your menstrual cycles are different lengths you can work out your average cycle length.

    The number of days in a womans menstrual cycle can vary month to month. Periods are not always regular. It can be useful to work out an average cycle length, based on the length of three menstrual cycles, to estimate when youre most likely to be ovulating.

    If you add the number of days in three cycles and divide the total number by three, it gives you your average cycle length.


    Sarah tracked her last three menstrual cycles by counting the time from the first day of one period, to the day before the next period.

    Cycle 1 was 28 days Cycle 2 was 32 days Cycle 3 was 27 days

    28 + 32 + 27 = 87

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Other Ways To Find Your Most Fertile Days

There are other ways to identify when youre ovulating. Pay attention to your body and youll see signs that ovulation is imminent. Your cervical mucus changes as you approach ovulation. Right before your egg is released, youll notice a change in the mucus discharge in your vagina. It will be clear, slippery, and appear like the white of an egg. This indicates a highly optimal time to conceive.

Another way to determine when you are ovulating is by charting your basal body temperature using a basal thermometer. This method is not as reliable as the OPKs and therefore its use is usually not recommended any longer.

Are Your Cycles Truly Irregular

I am having irregular periods. How do I know when I am ovulating?

An irregular period is defined as a menstrual cycle that is either shorter than 21 days or longer than 36 days. Your cycle may also be considered irregular if it varies significantly from month to month. For example, if one month your cycle is 23 days, and another it’s 35, your cycles would be considered irregular.

Research has found that variations in cycle length are associated more strongly with infertility than just having a shorter or longer regular cycle. In other words, if your cycles tend to be slightly longer than the normal range, but they are consistently that length, you may be less likely to experience fertility problems than someone whose cycles vary significantly but the length falls within the norm.

If your cycles are off by a day or two from month to month, you dont need to worry. Its when the variations are longerfive or more daysthat you may face fertility difficulties.

An occasional irregular cycle is also normal. Stress or illness can delay ovulation or menstruation, causing your cycle to be longer, and sometimes shorter, than usual. If you have just one or two of these “off” periods a year, you don’t need to worry. However, if your cycles are frequently irregularor you go quite a long time between menstrual cyclesyou should see your doctor for an evaluation.

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