I recommend fertility friend, from their privacy policy “ FertilityFriend.com is fully funded by its VIP service fees and has been so since we started. It does

I recommend fertility friend, from their privacy policy “ FertilityFriend.com is fully funded by its VIP service fees and has been so since we started. It does not rely on any type of data trading for any of its funding or any other purpose. In other words, you are not the product. Clear and straightforward, our charting service is what we sell and nothing else.” They also have a more data driven approach to fertility than most other sources.