Desperate!!!

Bella

So I had unprotected sex but he pulled out then I had sex again but with a condom. I just have a really bad feeling and I'm thinking about getting plan b but I don't no if its necessary. My bf said he's 100% he didn't cum in me but he also said if I wanted to get the morning after pill that would be okay to just be certain and not so worried. Please help I've never taken it and I don't know if I should ???