yes, it is not the norm, but some people have become pregnant while on their period. every woman ovulates at different times, which is usually 14 days after the first day of their last period, but like i said, it is different for every woman, it just depends on when you ovulate.
I agree with the above poster. It is possible, but not common. If your cycle is off one month, you might ovulate right after your period, and if there is sperm inside of you from when you were having your period (which can remain in you for a few days after sex) and ovulation starts, then pregnancy can occur. That's one way it can happen. Cycles can vary for many reasons, such as stress, changes in exercise or health problems. It's also common for teenage girls to have irregular periods because their bodies aren't used to being women yet. The best thing to do is either obstaine (of course, we all hear that one) or get on a prescription birth control (such as the pill or the patch) and/or use condoms to prevent sperm from entering.
uh yeah its very possible. Most people don't do it on there period so it rarely happens. But take it from me im 17 and 7 months pregnant and i learned that most people believe sperm only lives for a couple days but honestly it can live for almost 2 weeks.