ok girls, im probably clutching at straws here lol, but my temp dipped to coverline this morning so i put a pad on for afs arrival, but she still hasnt come. Ive got the tiniest amount of brown spotting on the pad now only just visable but ive never had this before af! Have af cramps too and now a pounding headache! Im 99 percent sure the witch is coming but was just wondering if implantation can take place as late as 13dpo???