He just now tells me..

So me and my SO have been having sex but we always use condoms. Last time the damn thing broke and he came in me 100% it was even leaking out. So I went fo get a plan B and this was not even a month ago! Maybe 2-3 weeks at the most. My period was only “2” days idk whatever that meant. Anyway we had sex about three days ago and he JUST now tells me “I think I nutted in you go get a plan B” as if I have $50 every time we have sex to get a fucking pill. So I’m thinking he’s lying because we NEVER went without a condom and I’m wondering what the hell made you not put one on. I could have sworn he did.. So he goes on to tell me that he’s serious and to go get a plan b ASAP. I’m like dude if you knew you came in me why TF did you not say anything the same exact day! He claims it’s bc he was “to tired”. The one thing that doesn’t make sense to me is he only brought up me getting a plan b is because I said I “felt” pregnant which pregnancy doesn’t even happen that quick! I’m guessing my body is still off from last times plan b. So he goes i only said something bc you said you felt like you were so I remembered that I came in you when we had sex THREE DAYS AGO! Something sound so off about this.. so now he’s expecting me to just go keep buying plan b’s. Is this even freaking safe???! And is it to late!? Bc he is tripping fr