Hi there. I have been dealing with an irregular period for about a year and a half now. I generally get my period every 28 to 30 days. I also have dark brown spotting for about 5 days before my period comes. The first day of my last period was October 30th and lasted five days. I have had unprotected sex with my bf and don't remember the exact dates but I know one of them was on the 10th. Today I noticed a pretty good amount of blood when I went to the bathroom. Almost so much I thought about using a tampon. This is unusual for me because I usually just get light spotting before my period. I guess I should also say I have been on a diet for the last month and a half and have been exercising and losing a good amount of weight. Could that be the cause?