I am 18 years old and have a feeling that I'm pregnant. I am on the pill and used a condom but the problem is that I was on antibiotics that made the pill less effective. I would be about a month pregnant if I am. I have had nausea, diarrhea, cramping, headaches, enlarged nipples and glands, stomach gurgling, increased sensitivity to smells, and dizziness as well as fatigue. I have taken 4 HPTs and they have come back negative but I still feel like I am!! The problem is is that I am on seasonale so I only get my period every 3 months but I was ovulating when I had sex. I'm not supposed to get my period for about 3 more weeks but want to know!!! I just have that feeling. Please help!