I am 13 days late from when I was suppose to start my period. A week after my period which was on the 28th of feb. I had a brown discharge for about a week. I have taken 4 pregnancy test and all of them have come back negative. I have been nauseous just by sitting, and have had very sharp pains in where my ovaries are on each side. I have been exercising more and my diet hasn't been that great also my sleep schedule has been crazy. Anyone have any idea of what this could possibly be? I've looked up symptoms for ovarian cyst and I have all of them.