Plan B question’ & comments

Ok so I’ve been dealing with this guy, we never had unprotected sex until the Friday that past. This dude has asked me over and over if I was on birth control, and I’ve told him on numerous counts that I wasn’t. He decides to tell me after sex he nutted in me.. now I never had to take a Plan B.. I’ve already was in ovulation .. and people are telling me that I basically wasted money, because “it doesn’t work when you’ve already ovulated.” I feel so annoyed because this guy knew.. and I don’t understand why he’d even put he in this situation. I need some type of answers .. does this morning after pill work or not? & yes I took it the very next morning when a store opened.