Possible?

So, I’ve been taking birth control for about a year now and my periods have been like clock work for the most part. Except this one. I’m currently supposed to be on it and I’ve had zero cramps, my discharge is just brown and I’m super dry down there. However, I know I can’t be pregnant because the last time my bf and I had sex was like a month or 3 weeks ago and we always check if the condom is still intact, and it was. So, basically my question is. If my period is normally pretty regular on BC, can it still be almost nonexistent randomly?