To start, I'm 20 and sexually active. I have experienced a sudden change in my menstural two months ago. It was the cycle was 23 days long with 5 days of bleeding. My last regular period was from April 30 to May 4. The next was May 23 and 24 with spotting on the 25 and 26. The next periods were June 19 and 20 and July 16 and 17. The spotting was much lighter the day after of these two months to the point all was needed was a panty liner and the periods were normal, somewhat clotty though. I have taken numerous pregnancy hcg tests and they all came out negative. If you could give me any information of what you think it is it would be greatly appreciated!