please help

Please.. I'm so nervous. I'm only 16 and I just had (protected sex as I always have had) with my boyfriend. I'm always so cautious about being safe. But today when we did. The condom broke after he came and he was inside me for a while after. I freaked when he pulled it out and it was completely broken. There was a lot of cum inside the condom still bit I'm sure that some got inside me. We raced to Walgreens and got some plan B. Am I going to be ok? I took a shower as soon as I got home as well... I'm so nervous. This can't happen to me.