I started using glow a years ago because I had irregular cycles and I needed to keep up with them. After getting married it helped me realize that I wasn't ovulating since we began to have desired for children. I found out I had PCOS. Used this as a diary that helped with explaining what I was going through and when with my doctor. I was then able to user my app for my cycles as well as really depending on it for accurate ovulation times with fertility meds. IT WORKED!!!! Pregnant with twins and wad able to accurately predict when conception occurred and due date. Thank you!