Flashing smiley face!!

I’ve been taking generic opk test and I’ve notice them getting darker. 2 days ago I tried clear blue and is showed low fertility. This morning I took the generic one and it was darker than I’ve ever seen. So I decided to try the clear blue tonight after work and sure enough it shows flashing smileys!!!! High fertility. I’m new to the ovulation test. When should I receive peak fertility? How often should I have intercourse? How long till I should receive a peak fertility or when should I consider my ovulation date? My prediction date on the app was not accurate as it showed last week