My husband and I are TTC and this is the 1st month of me using OPK testing. I know that the line has to be as dark of darker than the test line. But in wondering does it get darker the closer you get to ovulation. I am on day 16 CD and according to glow I should be ovulating tomorrow but I don't see that the tests are getting any darker. It does seem that 10 minutes after I take the test the line is darker and it dries up lighter. Any help/advic Is appreciated. We are praying for our 1st baby! *baby dust to everyone* thanks!