Ok so im 15dpo today and i started bleeding lightly about 3pm enough to feel i needed a pad just incase. I would be cycle day 30 today, what i want to know is basically i usually have between a 28-37 day cycle since coming off the pill last aug iv only had a short cycle twice, i got a peak opk on the 1st feb so would this be too late to be possible implantation or do you think it is just AF