Glow Ovulation Week vs. OPK

So Glow says my ovulation week is from the 21st - 27th. I'm using the clearblue ovulation a predictor kit and still haven't gotten that smiley face! If glow says my ovulation week is the 21-27, when would I expect to see that smiley face? My period started April 7th and I typically have a 30-35 day cycle.