help please

I had sex 3 weeks ago and while my boyfriend and I were havin sex the condom broke. Luckily it didn't break inside me and he didn't put it back in until a new one was on. How likely is my chance of getting pregnant? I'm also on the pill. My period while on the brown and white pills was more like spotting than an actual period but it stopped once I started my new pack. I'm completely crazy to be worried about this right? I'm panicking because I was so careful and I know that there's like a small percentage of people that get pregnant like this. I'm just scared.
UPDATE: lol I'm all good girls. Made my mans get me a pregnancy test (the ones you take right before your period) and I'm fine. I got my period the next day. I'm totally a-ok