Negative OPK Test

Meghan • Christ follower•Wife•diabetic struggling with PCOS•33 yrs old• TTC #1 for 3 years

When you are testing with an OPK (I’m using Pregmate) do y’all wait the whole 5 minutes or read it as a negative as soon as the control line is darker than the test line? I know I’m testing about a week early but I have enough tests and want to make sure I’m doing right and don’t miss a spike. I feel like it doesn’t change in the 4 minutes I sit there and stare at it.