Pregnancy risk?

Charlee • Hardcore believer in movie moments
Alright, I feel like I'm over thinking this whole situation but I want confirmation or some comfort that I'm gonna be fine.
I've been on the pill since December of 2015. I've never missed a single day and I've never taken it late. I'm so adamant about it because I'm a junior in college and I seriously don't want kids. We have always used the pull out method on top of the pill because I never wanted to risk anything. 
Well, literally 30 minutes ago, my boyfriend and I were going at it, and it was so good that I told him he didn't have to pull out. In the moment I didn't care and that's not like me. But now I do and it's bothering me. A lot. 
What are the chances of me getting pregnant? I worry myself sick over these things and some peace of mind would be nice.