Is it possible to be pregnant? had sex a couple days after a short period.

Yep, it's possible: Go get one of those pregnancy tests and follow the instructions. Just cut to the chase. If positive start a prenatal vitamin. If not get on the pill. Do not get pregnant by default, please? Raising a child right now may inhibit your potential or not allow you time to figure out the direction of a life vocation. Not to preach, good luck, just try the pregnancy test.