As I believe it is done, semen can survive in a woman's body for 3-5 days. So, you also cannot tell when a woman is ovulating. Even the 14 days counting after day 1 of her period is a myth. (It was a result of lazy research.)
So, for the people who do have sex while the woman is on her period, you should know that there is a possibility of pregnancy since semen survives in her body possibly until after the period is done and when the ovulation period begins.
Having sex without a condom will always have a slight possibility of pregnancy, even if the man hadn't dropped semen inside. But it happens on rare occasion.
Your best chance of knowing is through a pregnancy test, but keep in mind the chances of these test kits being wrong.
Is it normal that my girlfriend...
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As I believe it is done, semen can survive in a woman's body for 3-5 days. So, you also cannot tell when a woman is ovulating. Even the 14 days counting after day 1 of her period is a myth. (It was a result of lazy research.)
So, for the people who do have sex while the woman is on her period, you should know that there is a possibility of pregnancy since semen survives in her body possibly until after the period is done and when the ovulation period begins.
Having sex without a condom will always have a slight possibility of pregnancy, even if the man hadn't dropped semen inside. But it happens on rare occasion.
Your best chance of knowing is through a pregnancy test, but keep in mind the chances of these test kits being wrong.