I think he’s trying to trap me

So me and my boyfriend had sex maybe about a good 3 days ago and he had asked me already that week if he could cum in me and I take a plan b…which I said no to bc it messes with my cycle which I don’t like. He pulled out that day but I think maybe the next day he didn’t. Which I thought he didn’t but I wasn’t for sure….he tells me he’s been cumming in me and that I need to go get a plan b. Long story short we have been arguing a lot lately and I asked him yesterday if I could go get one (bc I don’t have a car) he doesn’t answer at first then later says he let someone use the car. So I asked how many days has it been since you did this and he says 2 but now I’m thinking and idk if it’s too late for my to take a plan b after 3 days smh Any other. time he’d be like you need to go get that pill but now he acts like he doesn’t care and I don’t want to be stuck with him rn bc of the stupid shit he does sometimes. Which don’t get me wrong I love him and he is a great provider but has his faults. No he didn’t rape me so please stop