First time/ first ever pregnancy scare:

I am 20 years old. You'd think I was going to be responsible, but it was my first time. I was saving myself for the right one, but decided to just give sex a try. I did it with my fwb, we weren't fwb, we were just friends at first. Anyway, I obviously didn't know what to expect, and things just happened in the moment. The next day I wasn't sure if he came in me or not. I was confused and panicking, because I couldn't remember when my last period was. I reached out to a friend who helped me get the morning after pill. I'm thankful she helped me through it, and never again will I not use protection. I'm thinking of getting on birth control, but I don't know which one to choose. Anyone else go through something similar, or anyone want to share their first time stories?