on the 10th of this month me and my husband had sex, afterwards I noticed I was spotting. I thought he knocked my period on. I continued to spot that day and the next. I also had backache mildly. on the 12th mid day it stopped, me and my husband went at it again. no spotting for maybe like a hour, then I'm spotting again. continues for the rest of the night. the next day during morning hours, it was just a tinged of pink then stops and haven't started again. my period is supposed to begin around the 22nd or 23rd. could it be implantation bleeding or ovulation bleeding. and all this started within my fertile week. good luck to all.