So December 6th i started taking medroxyprogesterone. AF came on December 16th, 10 days later... AF eneded on December 23rd 7 day cycle.. so all of a sudden today December 25th i had a light pink spotting type discharge and have been having pain in my lower back and in my stomach.. My question to you is could that be implantation bleeding or no? I have been taking medroxyprogesterone for a year now every 2 months when AF doesnt show and this has never happened to me before...