Spotting....

Just a quick question.... I just came out my fertile window and yesterday when I went to the bathroom I was spotting, just a LiL light pink and this morning NOTHING. I already had my period this month and not supposed to start again till February 4th. My nipples stay hard and breast are crazy sore.... I just wanna know is it normal to spot while in your fertile window or just coming out of it?! Thanks Angie