First time

just had sex with my boyfriend...we've been dating for a year and a half, and he came inside me today for the first time. I started crying because I've never had anyone do that and neither has he since he had always been extremely careful not to go and get anyone pregnant before we began dating, including me... we had been talking about it for some time since we love each other so much, and I got back from two weeks abroad yesterday and today it happened.. I'm just feeling so happy and nervous because it's the first time I let someone do that to me... but I also have some questions. I'm on birth control and have been for several years now. should I take plan B or just move along normally? we don't plan on this happening again until 5 years down the road when we are ready to become a family.