I know this isn't a safe method I probably won't be using it, but for people that have been using the pull out method for years and no scares. how do you track your ovulation so accurately ? I've been looking for really accurate apps for that bedsides this one. Though I probably won't use this method I like knowing what's going on with my body, and it's still helpful to know ovulation protected or not while sexually active. Also I've been using my apps for about three years so they have a lot of periods logged in them.