Trying to get pregnant! Help!

So I've been using this app for about... 7 months now. It tracks my period to the day extremely accurately. I haven't been on birth control since May. I'm looking to get pregnant. I just need some insight for this app. When it says that I have a 33% of getting pregnant, is that part accurate? What have your experiences been? I've never been pregnant before either, so there's that...