OPKs show high fertility but never a peak day

Yes best between 10am and 8pm 2 times a day till positive. You would need to be temping to confirm ovulation to know if you ovulated or not. Opks don’t confirm ovulation they only let you know when it’s about to come

Depending on when you’re taking the tests, it’s possible you could just miss the surge. Also, are you looking for yourself or are you relying on the app? I find the app to be very unreliable when it comes to measuring what’s high and peak.