Plan B

Me and my boyfriend were having sex and when we were on our second round he felt something sliding down the condom. He took it off and put a new one on. The next day he was freaking out because be thought he got me pregnant so he bought plan b and I thought we'll be okay. It's been a week and he's still freaking out so it's kinda freaking me out and I have no idea what to do or if there's even a chance of being pregnant. Please help 😂