My last period was on october 21st, and I am on the pill, so my periods are pretty set on a 28-day cycle. On the 21st, I hardly had any bleeding, and same with the next day (sorry for being straight-forward, but the tampon was only about 1/4 covered), which is abnormal for me. I bought a hpt on friday (4 days after period started), and it came out negative. My stomach (where uterus is) is very bloated now and my my period never was normal. I'm not sure whether or not I should trust the hpt, or to talk another one. I have some symptoms, but could they be due to something else? What should I do?