So I just started using OPKs. Glow says I’m ovulating, but my strips are negative. I understand that the test line needs to be darker than the control line. Does that mean to BD on the day of the positive result? Or the day after?

Also, girls with shorter cycles (mine is approx. 25 days) on what cycle day do you typically see an LH surge? I think I started testing too late. I’m on CD 14 and all my OPKs are negative.

Thank you ladies! I’m a little clueless over here.