Very helpful app for avoiding pregnancy or TTC! Ive been using it since last May when I went off of BC. The only things Id like to add are muscle spasms in back as thats a frequent symptom I have and also more stuff for the cm measuring as many days I dont find my cm fits into the 4 types. I think this app has been the most accurate in measuring my fertile window but I also use pee sticks and opk as a reference & update my Ovulation estimate as needed. I do like this app a lot for its articles but I like Glow for the community and any issue I have I google on glow first and usually find info.