i got my period like a day late , it lasted about 6 days which is aout 2 days longer then it usually lasts.. infact it started really slow then by the 3rd day which is normally a slow day i started getting heavy clotting.. im gaining weight althought im excersing and doing sit ups.. my lower stomach is just swelling and is hard like a prgenant womens stomach... my bras are feeling smaller.. ive taken 2 pregnacy test and they were both negative.. but i feel nausious sometimes not usuall in the morning though.. my body feel strange... and my bowel movements are not regular...what should i do?