Hello I had a question. I recently in the last three weeks been feeling nauseous off and on but no throwing up. My period was due July 16 but came the 20th with no normal signs its coming. When it came it looked dark brown and mucousy. First day I wore tampon and the next morning I woke but and it was very light followed by the next morning where it only showed up when I wiped. Usually my periods last 6-7 days and are very painful for first 2 days to where I need to sit with heating pad a lot and keep taken pain reliever. My usual periods also usually I go through lots of tampons. This last week I have been getting slight headaches and for the last two weeks I also have had little belching. My nipples have a greenish/purplish ring around the areola as well. I took a pregnancy test on the 14th and it was negative. Today on the 25th I have slight cramping but only mild. I'm so confused please tell me what you think it could be. Last time I had unprotected sex was the last week in June.

Do another test using first thing in the AM urine when you are 10 days late - it could be anything and without testing/an exam "we" are guessing.