Hi, I have always had fairly irregular periods. I am extremely fertile. I'm 39. I had a tubal ligation 17 yrs. ago. My period is due in three days. Over the past four days I've experienced daily spotting of a brown discharge, only visible when wiping. This was followed by spotting by what appears to be reg. period flow on the fourth day.. I don't believe I am pregnant, just wondering if it is possible that I experienced implantation bleeding. I've never seen this discharge before. There are a few other signs, no breast tenderness, painful intercourse, and pelvic tenderness. Also, I usually have severe cramos but haven't had any so far. Thank you