For some reason glow and Ovia never gets my ovulation right. But that's ok because I love to pee on a stick. I got these care check ovulation strips from amazon. They were $8 for 50 test strips. What I've learned from these test strips is that it will always show only one line unless it's positive. Most test will still show two. Just the test line will be very light, but these will only show one line until positive. Confusing? But who cares? I'm ovulating.