Can you get pregnant during your period? What there is to know...

We tend to believe that fertile periods only occur in the middle of the cycle. On paper, that's true. But the reality is quite different! Because every woman is different, with her own rhythm and hormonal fluctuations. So... Can you get pregnant during your period? Is there a risk of pregnancy if you have sex during the first few days of your cycle? We'll tell you all about it in this article. Let's go!

Let's review the basics: how does the menstrual cycle work?

The menstrual cycle prepares a woman's body for a possible pregnancy. It is a rather complex process that lasts an average of 28 days, but can vary between 21 and 35 days [1]. It is divided into 3 important phases: the follicular phase, the ovulatory phase, and the luteal phase.

1. The follicular phase

The follicular phase begins on the first day of your period and lasts until ovulation. During this phase, the pituitary gland (located at the base of the skull) releases FSH (follicle-stimulating hormone), which stimulates the growth of ovarian follicles. Of all these follicles, only one will "dominate" and continue to grow. The endometrium (the lining of the uterus) begins to thicken to accommodate a potential embryo.

2. The ovulation phase

The ovulatory phase most often occurs in the middle of the cycle, around day 14. Under the effect of LH (luteinizing hormone), the egg travels to meet a potential sperm in the fallopian tube. This is THE fertile period of your cycle! So if you want to get pregnant, this is the ideal time to have sexual intercourse.

During this phase, you may notice changes in your cervical mucus. It becomes clearer, more elastic, and more abundant. Why? Because it creates the environment that sperm need to make their way to the egg.

3. The luteal phase

The luteal phase follows the ovulation period and lasts approximately until day 28. The emptied follicle transforms into a corpus luteum, which secretes progesterone. This hormone continues to prepare the endometrium for the arrival of a potential embryo. If fertilization does not occur, the corpus luteum degenerates, progesterone levels drop, and the menstrual period begins. This is the start of a new cycle!

Menstrual cycles are therefore natural and repetitive mechanisms. But each woman experiences her own variations: regular cycles, short cycles, irregular cycles... Therefore, understanding how it works helps to better calculate your menstrual cycle. And thus to better manage your fertile period to avoid any risk of unwanted pregnancy.

So, can you get pregnant during your period?

Are you wondering if you can get pregnant during your period? The answer is yes, although it remains rare. It all depends on the length and regularity of your menstrual cycle. We'll explain everything.

Depending on the length and regularity of your cycles

If your cycle is short (less than 25 days) or irregular, the risk of getting pregnant during your period increases. This type of cycle means that your ovulatory phase can occur shortly after your period ends. Moreover, if your cycle is irregular, it's difficult to anticipate your fertile window. So if this is your case, you increase the risk of getting pregnant during sexual intercourse.

If you are on hormonal contraception

Are you using a hormonal contraception method? Then, the risk of getting pregnant if you have sexual intercourse during your period is very low, even non-existent. Some methods (like the contraceptive pill) inhibit ovulation and alter the uterine lining [3]. However, a simple oversight or improper use can reduce their effectiveness and increase the risk of ending up with a positive pregnancy test in your hands, so be careful!

If you are not using contraception

Without contraception, the risk of getting pregnant during your period, although low, is not zero. Sperm can survive up to 5 days in the female reproductive tract [2]: so if you ovulate early, fertilization during sexual intercourse remains possible. So try to use reliable contraception methods to avoid an unplanned pregnancy.

For example, you can check your cervical mucus or take your basal body temperature (= the lowest body temperature when your body is at rest) to identify your fertile period. And thus avoid having sexual relations during those few days.

Can you be pregnant and have your period?

Having your period and being pregnant is impossible

Having your period and being pregnant at the same time is biologically impossible. For one simple reason: periods occur because there is no fertilization during sexual intercourse, and the endometrium breaks down. If you are pregnant, naturally, this process does not occur.

But pregnancy bleeding can be confused with a period: metrorrhagia

However, many pregnant women may notice the appearance of bleeding during pregnancy and tend to confuse it with a period. Also called "metrorrhagia," this implantation bleeding generally occurs in early pregnancy (when the embryo nestles in your uterus) [4].

The case of cryptic pregnancy

Cryptic pregnancy is a phenomenon in which a pregnant woman... doesn't realize she is pregnant! She may continue to have bleeding, often interpreted as anniversary periods, and yet not experience the usual signs of pregnancy. She can carry it for several months (or even to term) without realizing it. But rest assured, this remains very rare!

Frequently asked questions

Can you get pregnant on the first day of your period?

It is very unlikely, but not entirely impossible if your cycle is short. The first day of your period corresponds to the beginning of a new cycle, ovulation is normally far away. But in women with short or irregular cycles, it can occur early, and since sperm can survive for several days, the risk, although low, exists.

Do sperm survive during menstruation?

Yes. Sperm can survive for up to 5 days in the female reproductive tract. It is this longevity that creates the risk: if intercourse occurs at the end of a period and ovulation happens early, fertilization remains possible.

How do you know if you ovulated early?

The main methods are monitoring cervical mucus (which becomes clear and stretchy as ovulation approaches) and measuring basal body temperature (which increases slightly after ovulation). Urinary ovulation tests also detect the LH surge that precedes ovulation.

Can you use your period as natural contraception?

No, your period is not a reliable contraceptive method. The risk of pregnancy, although low, is never zero without contraception, especially for women with short or irregular cycles. Consult your doctor or midwife to choose the method suitable for your situation.

So, what should you remember? Getting pregnant during your period remains rare, of course. But it is possible! And it mainly depends on the length of your fertile period and the regularity of your own cycle. Be careful not to confuse vaginal bleeding during pregnancy with your period. If in doubt, always consult a healthcare professional.

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This article is for informational purposes only and does not constitute medical advice. Consult your doctor or midwife for personalized advice on your cycle and contraception.