If you follow the typical cycle and ovulate only approximately 10 day prior to your period you should not get pregnant right after your period has ended. There are many times a woman's body will not follow that cycle and may ovulate earlier than normal. Many factors can cause this. It is risky to rely on your cycle as your only means of preventing pregnancy. Many women have become pregnant with that method. What is your friend doing to prevent STD's? This is perhaps a bigger risk and could be life threatening. She should always insist on her guy using a condom. This will significantly reduce the risk of an unplanned pregnancy and STD transmission. So, the short answer is use condoms! Tell her that and encourage her to take care of herself as nobody else will.

So far as I know they were eachother's firsts so I'm guessing that she has done nothing about STD's. She doesn't go into detail about that stuff with me haha. Thanks for clearing up my question, I'll talk to her about using condoms becuase I agree with you, she needs to take care of herself. I'm prepared to be there for her, should anything happen, but I don't want anything to