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    When Should You Take A Pregnancy Test With Irregular Periods?

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    When Should You Take A Pregnancy Test With Irregular Periods?

    Updated on 3 November 2023

    Medically Reviewed by

    Dr. Shruti Tanwar

    C-section & gynae problems - MBBS| MS (OBS & Gynae)

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    Discovering that you are pregnant is a thrilling experience that brings both excitement and joy. The most common indicator of pregnancy is a missed period, but what if your periods are irregular, to begin with. Let us discover all about irregular periods and when should you take a pregnancy test if you have irregular periods.

    Menstruation, or periods as we know them, is a routine exercised by a female's body that anticipates a pregnancy every month, from menarche to menopause. Most women have a menstrual cycle that's 28 days long (though the range varies from 24 to 38 days). If the variation between the cycles is 10 days or more and the duration of the cycle keeps changing, they are termed irregular.

    Causes of Irregular Periods

    Various factors can lead to irregularity in periods. Irregular periods can cause a delay in pregnancy since ovulation may vary from month to month. Some common causes of irregular periods are:

    How to Plan Pregnancy with Irregular Periods?

    A woman gets pregnant when she has intercourse during her ovulation period. In the case of irregular periods, determining the period of ovulation gets tricky. But the good news is that a human sperm has a shelf life of five days once ejaculated into a female's body. So, the easiest way to get pregnant with irregular periods is to have regular unprotected sex throughout the month. When intercourse is performed every 2 or 3 days, the chances of the sperm missing the egg get minimal.

    How to Check Pregnancy with Irregular Periods?

    When a woman has a regular cycle, a missed period is the most important indicator that she might be pregnant. But in the case of irregular periods, this is unclear since you may be unsure if it is just delayed periods, or if you have missed a period. Most women who have irregular periods have various questions in their minds, such as - When to test pregnancy after sex, when to do a urine pregnancy test, how soon will a pregnancy test read positive, after how many days pregnancy can be confirmed by urine test and when to take a pregnancy test after missed period.

    Early Signs of Pregnancy

    Well, there are many signs that are present even in cases of pregnancy with irregular periods, which you must watch out for:

    1. Implantation Bleeding or Spotting

    Implantation of the fertilized egg takes place 1 or 2 weeks after fertilization. It may be mistaken for a light period. The differentiating points are:

    • Implantation bleeding has no clots
    • It's very light
    • It's pink or brown, while bleeding during periods is reddish
    • It lasts only for 1 to 3 days.

    2. Nausea or Morning Sickness

    Hormonal changes result in low blood sugar levels in the morning leading to nausea, which might or might not be accompanied by vomiting. Though mornings are usually affected, such nausea can bother a pregnant woman any time of the day.

    3. Fatigue

    Increased progesterone levels lead to changes in the body that prepares itself for the fertilized ovum. Those changes physically drain pregnant women.

    4. Frequent urination

    This symptom stays throughout the pregnancy. Pregnant women experience frequent urges to pee because their uterus begins to stretch to make room for the foetus. As a result, the uterus exerts pressure on the bladder, causing frequent urination.

    5. Mood Swings

    Pregnant women may experience sudden mood swings, even early in their pregnancy. This is because of the surge in hormones in the body which causes women to feel moody and emotionally vulnerable.

    6. Swollen or tender breasts

    Breast tenderness or swelling is one of the earliest signs of pregnancy. This happens because the body begins to prepare for breastfeeding the baby growing inside the mother's body.

    7. Headaches

    Headaches are a common sign of early pregnancy. Many women experience headaches during their pregnancy.

    8. Backaches

    As the pregnancy progresses, women may experience backache because of the weight gain and expanding belly.

    9. Cravings and aversions toward certain food items

    Many women experience peculiar cravings or aversions towards certain food items and their smells. In fact, this likeness may even be towards foods they never liked before and dislike towards foods they used to like.

    When to Take a Pregnancy Test with Irregular Periods?

    If you suspect you are pregnant, even if you have irregular periods, you can count 36 days from the start of your last menstrual cycle or 4 weeks from the time you last intercourse. At this time, your HCG levels will be high enough to be detected in a urine test if you are pregnant.

    Diagnosis of Pregnancy with Irregular Periods

    Home pregnancy test kits are usually accurate in ladies with regular periods. But if a lady with irregular periods experiences signs of pregnancy or her periods get later than expected, the situation can get tricky. The kit will detect pregnancy as early as 28 days after the last intercourse as it detects the hCG levels in urine which start rising right after conception.

    If the test comes out negative and the signs and symptoms of pregnancy persist, the test should be repeated a few days later. If the test is still negative, you should see a doctor.

    When to See a Doctor for Pregnancy with Irregular Periods?

    If your home pregnancy test comes out negative even after experiencing pregnancy symptoms and an unusually delayed period, you should see a doctor for pregnancy. The doctor will conduct the following examinations to confirm the pregnancy:

    Besides these tests the doctor may also check your heart rate, weight, blood pressure, 24 hours urine analysis and conduct a pap smear.

    How to Determine Pregnancy Due Date with Irregular Periods?

    In the case of pregnancy with irregular periods, it can be very difficult to determine the due date of delivery using the LMP, i.e., Last Menstrual Period. In such circumstances, ultrasound plays a crucial role. An ultrasound scan can be done at any time after 6 weeks into the pregnancy. It studies the development of the embryo and hence helps calculate the gestational age. This further helps determine the exact due date of delivery.


    If pregnancy is confirmed in a lady with irregular periods, the normal protocol is followed as in the case of a lady with regular periods. But, if the pregnancy is not confirmed, she's treated for the underlying causes that lead to irregular periods and other pregnancy-like signs. These may include:

    • Cyclic hormonal treatment in case of ovarian insufficiency and PCOS.
    • Oral contraceptives are used to regularise the periods.
    • Treatment of other illnesses like diabetes if they are the root cause.
    • Treatment of stress.
    • Regularising the sleep pattern.
    • Paying attention to and treatment of eating disorders

    You may also like: Can PCOS Tea Help You Regulate Your Irregular Periods?


    Irregular periods are unpredictable and hence confuse a sexually active woman as to whether she is pregnant or not. A keen eye on the symptoms and timely medical intervention help smooth her journey. So, if you have irregular periods but have had an unusually delayed period and experience some other pregnancy symptoms, you can take a pregnancy test to find out if you are pregnant or not.


    1. Nobles J, Cannon L, Wilcox AJ. (2022). Menstrual irregularity as a biological limit to early pregnancy awareness. University of California

    2. Wilcox AJ, Baird DD, Dunson D, McChesney R, Weinberg CR. (2001). Natural Limits of Pregnancy Testing in Relation to the Expected Menstrual Period. JAMA

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    Medically Reviewed by

    Dr. Shruti Tanwar

    C-section & gynae problems - MBBS| MS (OBS & Gynae)

    View Profile

    Written by

    Priyanka Verma

    Priyanka is an experienced editor & content writer with great attention to detail. Mother to a 10-year-old, she's skille

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