Period 3 days late after losing virginity...

So I just had sex for the first time about a month ago, and at the time I had literally just finished my period like that day - experienced some spotting afterwards but nothing major. So anyway, my period is now 3 days late and I’m starting to wonder if this is normal or if I should consider the possibility that I could be pregnant - we used two condoms (because the first one started to slide off) and neither of us even finished - but then again I’m not sure. Should I be worried or just keep waiting?