Fertility apps

Megan • 👶🏼 6/13/18 💙

Does anybody else use another fertility app that has different predicted days of AF/ovulation? I'm super new to this (and haven't tracked with ovulation tests) and Glow tells me AF starts on the 10th, but Ovia tells me it's expected on the 8th, also saying that I ovulated earlier than Glow had said. Im super confused and wondering other ladies experiences! Help!