I really don't know what to do here. My girlfriend and I have been having unprotected sex for a while now and I usually pull out before anything happens. But this past time I still pulled out, but I am pretty sure that I still did ejaculate into her before I did. Are there great odds that she would be pregnant? Also, she just got off her period a little while ago, when is it most likely that a girl would get pregnant in relation to when her period is?
Dude, you need to use a codom. It would also be a good idea for her to use birth control. There is a very good chance she could get pregnant. precum can get her pregnant too, so just pulling out before you cum is not as good as you think. ARE YOU READY TO BE A FATHER?
To answer the specific question, the most fertile time is around the middle, between periods. With luck, you'll escape this time - but you won't always be lucky.