I had sex in July. I started getting nauseous and really tired a few weeks later. My period was about 5 days early and only lasted 2 days when it normally lasts 5-7 days. I took a HPT and the results negative. My periods are always on time; it's like clockwork. My symptoms started getting worse. I started feeling really nauseous to the point I couldn't move, and my breasts started hurting really bad and felt larger than normal, my fatigue got so bad I would fall asleep in class. My period for september came not really on time with my other one and only lasted a day and didn't even feel up a pad the entire day. The one for october was the same way. Is it possible I could be pregnant?? I still have all the same symptoms except now they have worsened. Any advice would be appreciated.