Pregnancy paranoia

So on jan. 14, a day after my period, I lost my virginity and we had unprotected sex but he pulled out waaaayyy before. 2 weeks later j started lightly bleeding for about 8 days and I freaked out. Ever since it happened I've been worried about the possibility of being pregnant. In February I thought I had my period but it last about 3-4 days. I should start in the next 10 days. I don't have any symptoms or anything I'm just really paranoid. I could really use advice or anything at this point! Anything would be a great help. Thanks you!