Pregnant???

Omg okay, so I lost my virginity last night to a friend and his dick was pretty smal and I think the condom was too big and it slipped off but we didn't realise until he had finished, it was inside me and we couldn't find it for a few minutes and then it kinda slipped out, but I'm kinda worried that I could be pregnant?? Cause yesterday was my first day of ovulation and he came without the condom on, i know not to stress cause that will make my period take longer to come if I'm not pregnant, and I know there's probably no way to tell this early, but I just wanted to hear some of your advice?? Also I'm not on the pill or anything :)