Clear blue Digital Advanced OPK


I purchased the Clear Blue Digital Advanced OPK. I tested yesterday around 9am and it showed ‘low’. I tested again this a.m around 8 am it still showed ‘low’. I tested again around noon just to see if there was a difference, there was a flashing smiley (‘high fertility’) should me and DH be bd’ing every day from now until the day after I ovulate. I’m really new to this. First month buying OPK.