Can you while on your period?

Answer 1

Yes. It isn't common, but it does occur. The reason some women conceive when they are on their periods is because they either have a short cycle or they just ovulate early and have a long luteal phase. You can have sex up to 7 days before ovulation and conceive becasue the sperm can live that long. Sperm life inside the woman's body is generally 3 to 4 days, but they CAN survive for up to 7 days. This means you have a fertile window of UP TO 7 days. So, lets say your period is 7 days long and your cycle is 26 days long. You have sex on day 6 of your cycle - you are still bleeding. Now lets say you ovulate on day 11. This will make your luteal phase 15 days, which is very average. You had sex 5 days before you ovulate so there COULD still be viable sperm waiting to fertilize the egg.
It would be very unusual.