Bf is worried

Hey y’all so I had unprotected sex on April 22 and took a plan b on the 25th only because my bf is worried about precum but he pulled out. I was supposed to get my period on the 28th but it never came so it’s 9 days late which I’m not too worried about only because I know that the pill messes up your cycle; although I didn’t get any spotting after I took the plan b so I’m not sure why that is.

Any insights would help but this is just really for the reassurance my bf cause he’s been thinking about it too much lol