Hi doctor , i have small question , i had sex with my girlfriend after her period finished by two days. i didn't ejaculate inside, could be pregnant?

Possible/Less LIKELY: There is a chance for her to get pregnant as precum also contains sperms but much smaller in numbers and sperms can live in the vagina for up to 5to7 days and there is a chance of early ovulation as well. So considering all that there is an outside chance of pregnancy but much less likely i suggest you use a condom to prevent pregnancy or another safe birth control method.

Depends.: How long was her period? If it was long then you might have deposited enough sperm in her vagina from pre-ejaculate fluid so some viable sperm could be present when she ovulates. Unlikely but not impossible. Using a condom would markedly reduce the risk of unwanted pregnancy and std.