Hi, does anyone have experience with using OPKs to track ovulation?

I’ve got a regular 28 day cycle and have been tracking my periods for around 1 year but only recently (the last 2 cycles) started ttc tracking BBT and using Ovuplan OPK test strips because DH & I decided to try for baby #3.

I find tracking my CM not helpful as it changes quickly from egg white start of my fertile week to dry. Tracking BBT confuses me and using an App on my phone as a guide but then the OPK tests are coming back negative during my fertile week.

Argh feeling so frustrated! Conceiving our first 2 babies wasn’t this hard.
Please help, any advice would be much appreciated