Period/pregnancy

Me and my bf haven’t been preventing pregnancy but the day i was supposed to get my period i “got” my period but it’s very light bleeding and only lasted like 3 days my period normally lasts 5-7 days. Can this be pregnancy or is this just my normal period? i don’t want to take a test and then have it negative and me over thinking the situation. we did have sex while i was ovulating as well.