Period

Hi, so July 4th was the day I lost my virginity and remind you, I just got off my period that day. The guy used a condom and I took a pregnancy test 5 days before my period was due and it came out negative.. I'm 4 days late and I'm still scared.. idk if it's because I'm stressing so much or because it was my first time so my body is still functioning?? Help :(