I am using First Response OPK 9 test kit. Not digital. I don't remember reading a specific time frame to take the test in the instructions. But I read online most tests should be taken between 2-4 PM due to LH being produced later in the day (although it is present all the time)
I took my first one with FMU yesterday so today I didn't know if I should wait until the 2-4 PM time period?