My best friend has liked me since we were 12/13, we’re 17 (almost 18) now.

I started liking him back last year and have truly began to feel he could be the one.. so many emotions have been exchanged and everything was genuine between us.. well, I got drunk a few days ago and I had unprotected sex. He came in me & I had to buy an emergency contraceptive after. However, I was ovulating & I think I may have a high chance of getting pregnant. I’m so stupid.