Late Period! Please Help!

My period is 13 days late! I’ve had it for about 4 years now and it’s only been irregular like twice. It came right on time for a few months but the last few months it’s been late, but never this late! I’m a virgin but my boyfriend has fingered me before like 15 minutes after jerking off, but he washed his hands very well and wiped them off. I’m very stressed, which could also be causing it, but I just really need to know if there is a good chance I could be pregnant.