What do I do?

I had raw sex with my boyfriend after only taking 2 birth control pills. He finished inside of me 4 times. I stopped taking the pill after those two and never bothered to get a plan B.

3 days later I started bleeding and had (what it seemed like) was a second period which lasted 5 days, but I’m not sure if that’s what it was.

How likely is it that I’ll fall pregnant?