Hey guys. Its my first cycle using OPKs and started testing the day before Glows predicted fertile window. If you look at the pic, u can see faint lines from the 4th test down and for the next 4 tests. I know these r supposed 2 get as dark as or darker than the control line but these never did. My tests are all completely blank now and im still testing a few times a day. Do u think that could have been my ovulation or should i keep testing? Not sure if im wasting my time now or if its still to come. Whats your experience with how dark the test line got?