My husband and I have been TTC for 2 months. This third month, after some research on how to conceive, I decided to buy an OPK to pin point my ovulation! My cycle is usually around 27-28 days, so according to the directions (clear blue digital ovulation test) I was to start on the 10th day of my cycle, but I started on the 5th day (I didn’t want to take a chance and miss my ovulation lol). According to the <a href="https://play.google.com/store/apps/details?id=com.glow.android">GLOW app</a> my fertile window was from Jul 31st - Aug 6th. So I’m taking my OPK everyday and nothing ! Cycle 14 I started taking a test in the morning and late afternoon, still nothing! I was so worried that I missed it or that I just was not going to ovulate this month, talk about discouraging! So long story short, this morning I have only 1 test left, cycle day 20, and I get a smiley face!! I’m so happy! So if there is anyone out there who’s not getting a positive, keep testing!!