could i still be pregnant?

I have been worried about the exact same thing! I have been stressing for 17 weeks now that I could be pregnant. I have had continuous cramps and sore boob (but that stops when I get my period. I'm on the pill and haven't had sex since Feb (condoms & pill used correctly) but I haven't felt right ever since I have had 5 periods since then... Major cramping and only bleeding during my break week besides spotting a few days before finishing my packet (I have been on antibiotics for 3 months so that could be why I have spotting) My periods have been normal, not extremely heavy but I have had to change 3-4 times a day. so I think that would be considered as a period - it went for 5 days. I have taken 8hpts and they have all come back negative. But people on here have scared me because they say you can have bleeding and still be pregnant so I have been freaking out. Surely if I was pregnant I would have bleeding at other times during the month not just on the time of my period with cramping... I hope everything turns out okay for you because I know how you feel! I can't seem to get an answer either!