A little nervous.. would love some opinions

I have always been one to be scared to have sex because of unwanted pregnancy. I have been with bf for almost two years now and we finally did it. I have been on the pill for a month now and take it on the dot same time everyday. We had sex when I was on the sugar pill and the condom broke and he had came, I got scared and took Take Action (plan b). Do you think I can still get pregnant? I know this sounds crazy but I am terrified of getting pregnant and I can’t stop worrying about it! Please give some advice! ( also I am a bit overweight and I heard it effects BC & EC)