My cycles are regularly 35-40 days and i have been oculating around cd 27 each cycle. I have always had heavy periods and cranos but doctors have said there is nothing to worry about. According to opks, and cm, i ovulated on February 4th which was cd 29 for me. Im now 8dpo or cd 37 and started spotting 2 days ago. Today i am lightly bleeding(which i almost never do), wondering if implantation can be light bleeding and not just spotting. I've had dark almost black, brown, pink, and bright red blood though. If it isn't implantation (of which I'm fairly sure despite trying so hard) why would my period be early? Should i be worried? Should i call a dr.? We have been ttc since october, this will be my 5th cycle that I've failed...