Weird bleeding on period?? Please help

I've been on the pill going on 3 months now and I've been taking it exactly how I am supposed to. When I have my periods however it's normally brown in color (just brown, never red anymore) and it has gooey discharge, and it's barely any bleeding. Is this type of bleeding normal? Could I still be pregnant? I haven't had any symptoms but I feel like my stomach has gotten kinda bigger in the lower part of my abdomen only, it's strange. Please help ease my mind! Thanks!