You can use Glow from simple period tracking to tracking assisted fertility treatment. Most importantly you will learn a lot about your cycles and how your body ticks. The app is very complex if you want it to but at the same time very simple in use. Husbands and partners can also take part without being informed about all your body, cycle or life details ;) There is also a very big and very active community with which you can exchange as much information and experience as you are willing to. The customer service is very good and keen on feedback, which I have seen to be incorporated into the App on many occasions. If you happen to be pregnant already make sure you also check on Glow Nurture to virtually watch your embryo(s) grow into a baby and get all sorts of useful time sensitive information on your pregnancy on a daily basis. Im so very happy to have found this app. Im pretty sure you will be too. ps: Dont forget: Our bodies are not always as predictable as we would like to. You will have to enter data for a few cycles before you get (almost) reliable data on upcoming periods, ovulation or fertile days. Use common sense or ask in the community when something seems to be off.