The last year I've had 2-3 days of bleeding every 27-29 days... this month my period was Nov 19-20, then dry days Nov 21-22, but I started spotting on the 23 and it hasn't stopped spotting is light enough that only happens when I wipe or a light panty liner and is brown in color. Wondering what could be the cause? I haven't been on birth control for years and we don't prevent pregnancy, having sex almost every day. I dont think it could be implantation or ovulation bleeding that soon after the end of a cycle, right??!

Ideas?