What the heck is going on? ?

I have been on seasonique birth control for almost three months Which means my period should be starting next week but for some reason I feel like I could have gotten pregnant while I was taking antibiotics with no other protection. I have had weird things happen, headaches, nausea, feeling bloated, hungry and not gaining weight, tender chest, slight cramping and urgency to urinate but I'm still not sure anybody had this happen to them before. I'd appreciate some advice. This would be my second pregnancy and that is why I feel Luke I could be cuz I just dont feel right.