Getting pregn ant after 1 night of unprotected sex?

It definitely all depends on your ability to conceive, your positioning, if he actually managed to ejaculate inside of you. Sex without ejaculation (or coming, as it is often called) can not induce pregnancy, as many of my paranoid friends have thought. If he did ejaculate while he was still inside of you, it is likely you could be pregnant. All it takes is one time. Don't be paranoid about it, but I think you should most definitely get a pregnancy test.