Late period

My boyfriend and I had sex like a week or two ago unprotected a few times and I took a plan b after each time (maybe like 3 days so like 3 plan b in total) and I also started birth control again a few days after that because I previously was off of it. My period is 8 days late as of today but I was thinking it’s because of the plan b and bc because I was spotting about a week after I took the birth control. I’m also a little nervous though as one would be. What should I do?