For the past 3 months my periods have been lighter and shorter, I barely fill 1/3 of a pad. They are usually really heavy with a lot of blood clots and painful cramps and I usually start cramping 1-2 days before my expected period but since my cycle on september 28th My periods come on time but with none of the premenstrual cramps or symptoms I sometimes almost think i'm going to miss my period then it comes very light and almost watery with some pinkish brown mucus. I've also been expierencing nausea, headaches and dizziness. Could it be possible that I am pregnant and have been for almost 4 months but didn't know because of the bleeding? My boyfriend thinks i'm crazy but My mother said she expierenced period like bleeding for the first 6 months she was pregnant with me. I took 4 pregnancy test in october and november and a blood test which all came back negative. I still feel pregnant but again I had my expected period on dec 20th, even lighter than the past two also with mucus. am I going crazy?? help please