Hi. So I'm On Birth Control And Usually Around My

Hi. So I'm on birth control and usually around my time of month I always get it at the same time, so it's pretty regular. Today I was supposed to get my period, but I wasn't bleeding I had like a pinkish brown discharge and I changed my pad and I only had 2 spots for the rest of the day. I'm having horrible stomach cramps and I'm wondering can I be pregnant?

Thank you