I used the clearblue digital advanced ovulation predictor. I know that the flashing smiley face means that I will ovulate soon and that I'm at high fertility, and the peak detects the hormone surge for ovulation. I had peak from 11/3 till 11/4 since it stays peak for 48 hours. Which of the day's do I actually ovulate? I am curious how many DPO ovulation I am. I just experienced light spotting and I'm trying to think whether it's possible that I ovulated later than I thought and its IB or if I ovulated 11/3 and its early AF. I've never spotted between periods or had an early AF even before I went on the pill.