My fertile time in this app is always off. I opened it like a few days ago and it was like "you're ovulating!!" When I know I'm now because I just started feeling my ovulation pain yesterday which for the third month in a row has been on cycle day twelve. I guess it just bothers me because I feel as if there may be individuals using the cycle as a way to know when to be extra careful or TTC but a few days/ week makes a huge difference for the both of those. Just make sure you lovely ladies are all logging as well as paying attention to the signs your body gives you. I love this app and all but it doesn't know me as well as I do.