Late period by 3 days

Hey y’all. I’m on the combination pill and I take it from 10am-10:30 everyday (so I should be pretty good protection wise). My boyfriend and I have had sex a few time unprotected but he never cums inside or gets close to doing so (he prefers to finish by blowjob). My period is late by 3 days. Is this this pretty normal or should I worry??

I did just get back to college and it’s the middle of sorority recruitment week. I’m just getting stressed about it.