Can You Get Pregnant When You’re Not Ovulating?

    Published 14 June 2021
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    Understanding when it’s possible to get pregnant is important whether you’re trying to conceive or want to avoid an unplanned pregnancy. During ovulation, your body releases an egg, which can be fertilized by sperm. In this Flo article, we explain all about when conception is possible, and when it’s not. 

    Can you get pregnant outside a fertile window?

    Your “fertile window” refers to the time it’s most likely to get pregnant. In a typical menstrual cycle of 28 days, there are around six days when you’re most fertile (five days leading up to ovulation through one day afterwards).

    But it’s important to keep in mind that cycle length can vary greatly from person to person, which was shown in a study conducted by Flo and the University of Adelaide. Even in people with regular cycles each month, the timing of the fertile window can be highly unpredictable as ovulation can take place on different days.

    So, can you get pregnant when you’re not ovulating? The short answer is yes. It’s possible to get pregnant outside of your predicted fertile window because timing of ovulation may differ each month and sperm lives in the body for several days. Therefore, though more unlikely at some points, pregnancy can result from unprotected sex at any time during your menstrual cycle. If you want to avoid pregnancy, there’s actually no “safe” time of the month to have unprotected sex so it’s important to always use contraception.

    Know when you might be ovulating

    By tracking your cycle, and body signals, Flo helps you work out when you’re most likely to get pregnant.

    You can calculate your fertile window by trying this online ovulation calculator, by tracking your cycles with Flo, observing your cervical fluid, and taking your body’s basal temperature (just remember that Flo's predictions should not be used as a form of birth control). 

    Let’s take a closer look at the possibility of conception at the different phases of your cycle.

    Days before and after ovulation

    Ovulation usually occurs between days 11 and 21 of your cycle (14 before next menstruation). The first day of your period signifies the beginning of your next cycle. When you’re ovulating, an egg is released from your ovaries and moves down the uterine tube towards your uterus.

    An egg lives 12-24 hours following ovulation, but sperm can live in the female reproductive system for up to five days after sex. Therefore, having sex from five days before or one day after ovulation can result in pregnancy.

    A 2019 study found that women who have unprotected sex one day before ovulation had the highest probability of getting pregnant (41 percent).

    On your period

    You may have heard that it’s not possible to get pregnant when you’re on your period, but this is a common myth. Although the chances are low, pregnancy is still possible during your period.

    For instance, if you have a shorter menstrual cycle (around 21 to 24 days), having unprotected sex during your period could result in pregnancy. This is because sperm lives in the body for several days, so if you ovulate early in your cycle, conception could result from sex while on your period. 

    Right before your period

    Getting pregnant right before your period is extremely unlikely, but not impossible if you have a short cycle and ovulate very early on. 

    Right after period

    While it’s not that likely, it’s still possible to get pregnant right after your period has finished. If you have a naturally shorter cycle and bleed for seven days, for instance, you can ovulate directly following your period and get pregnant.

    To plan pregnancy, having sex every couple of days means that there will always be sperm ready to fertilize the egg as soon as it’s released. 

    Track your period and symptoms to see your unique cycle patterns.

    Cycles without ovulation: Can you conceive?

    Just like periods aren’t always regular, neither is ovulation. The day you ovulate can vary from cycle to cycle, and in some cycles, ovulation may not happen at all. This is also normal.

    Irregular ovulation occurs when the ovaries and pituitary gland (hormone regulator at the base of the brain) aren’t communicating properly about when to release an egg. 

    Anovulation: What can it mean? 

    In an anovulatory cycle, no ovulation takes place, meaning that your ovaries don’t release an egg. During this type of cycle, women may have some bleeding caused by uterine lining buildup or a drop in the estrogen hormone without having a true menstrual period.

    Anovulation will make you skip fertile days if you’re trying to get pregnant, and is responsible for around 25 percent of female infertility cases.

    It’s normal to have anovulatory cycles from time to time. It occurs most often when a person is first starting to menstruate or approaching menopause, as the body has a hormonal imbalance during these transitional periods, which interrupts ovulation. 

    Is it physically possible to get pregnant if you’re not ovulating during a cycle?

    It is not possible to get pregnant in a cycle without ovulation. This is because in this type of cycle, no egg is available to be fertilized by sperm.

    There are treatments available that can trigger a woman’s body to release a mature egg that allows for conception. If you’ve been trying to conceive for a while and think that ovulation issues may be present, get in touch with a health care provider. 

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    Pregnancy is most likely in the five days leading up to ovulation and one day afterwards, which is known as your fertile window. The timing of your fertile window can differ from month to month because ovulation isn’t always regular, so it’s important to always use contraception if you want to avoid pregnancy. If you’re trying to conceive a baby, having sex one day before ovulation has shown the best results. In the case of anovulatory cycles, it’s not possible to conceive if you don’t ovulate during your cycle at all because there is no egg available to get fertilized by sperm.

    Note: Ovulation predictions should never be used for birth control


    “How can I avoid pregnancy? Your contraception guide.” NHS, 24 Mar. 2021, 

    “Fertility Awareness-Based Methods of Family Planning.” ACOG, Jan. 2019, 

    Faust M.S., Louis et al. “Findings from a mobile application-based cohort are consistent with established knowledge of the menstrual cycle, fertile window, and conception.” Fertility and Sterility, vol. 112, no. 3, 01 Sept. 2019, pp. 450-457, doi:, 

    “Can I get pregnant just after my period has finished?” NHS, 23 May 2018,'re%20most%20fertile%20at,period%2C%20although%20it%20can%20happen. 

    Wilcox, Allen J. et al. “The timing of the “fertile window” in the menstrual cycle: day specific estimates from a prospective study.” BMJ, 18 Nov. 2000, doi: 10.1136/bmj.321.7271.1259,

    Mayo Clinic Staff. “Female infertility.” Mayo Clinic, Mayo Foundation for Medical Education and Research (MFMER), 27 Jul. 2019, 

    “Periods and fertility in the menstrual cycle.” NHS, 05 Aug. 2019,,to%2040%20days%2C%20are%20normal. 

    History of updates

    Current version (14 June 2021)

    Reviewed by EBCOG, the European Board & College of Obstetrics and Gynaecology

    Published (14 June 2021)

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