I have done a bit of research on this, but I'm still freaked out a little and would like to get other women's opinions on this.

I am 22 years and have been on the pill since I was 16. Just yesterday, for the first time ever, I started bleeding. It was more like the brownish blood you get towards the end of your period. As of right now, I think it stopped. I have never bled in between periods, even when I wasn't on the pill. Ever since I've been on the pill, I have been able to know exactly when I'll get my period. I'm scared of what this could be. I know that this is normal sometimes, but it has just never happened before...