confused

I had unprotected sex last month but I've been on the pill since December. I took two pregnancy tests anyway after having the same symptoms I had with my last pregnancy both came back negative and I get my period. The past few days though I've had really bad cramps and thick white discharge to the point where I have to check to see if I peed/got my period. This isn't normal for me but just wondering if it's a late side effect of the pill or if it's normal for anyone else