late period while taking the pill

So I don’t have my period yet. I’ve been on the combined pill for 5 months now and I just took my 1st placebo of the monthly pack last night. Usually I get my period the day that I take my placebo (before I take it) so it’s weird that it’s not here. I’m worried because my boyfriend and I had unprotected sex this week. He didn’t cum inside of me and i’ve been taking my birth control at almost the same time this whole month but it’s weird that I haven’t gotten my period yet. Any ideas of why it could be that way?