Started spotting today at 7dpo, no cramps or anything, just a bit of a sore lower back, but then I've had problems with my back since having my first so I dont really bother counting that as a symptom. Last cycle my lp was either 10 or 11 days. Is it normal to get a period a week early? Or is it implantation bleeding? I didn't get IB with my first but I don't know if that means anything. Can breastfeeding change your lp month to month?