Hello, last month there was a little bit of blood on my pants nothing else came until my period 2 weeks later. This month I had light brown/bright red, light pink and dark brown spotting a week before my period should be due and I had this for 7 day. There were a couple clots. It was quite heavy the first days. I also had headaches, fatigue, nausea, sharp pains in lower stomach, chest pains, cramps, pains in upper stomach I have irregular periods. Preg test was too early to take and urine sample came clear with no infections. What is this?