I hear ya, the same exact thing happens to me! I enjoy having light periods but they do last long and are very unpredictable...normally my PMS symptoms are exactly the same as before...headaches, cramping, bloating and irritablilty but when I think I might be starting and I have sex with my husband, the next day my period starts and about 2 weeks all that light spotting will slowly disappear...strange, huh?? I am going to have a yearly and I am going to ask that same question, but I actually have asked several other women with all the same experiences as us...I hope this give you some peace of mind, and if not talk to your doctor or check up on the website!!!Good Luck!!!