Fertility awareness-based methods are a form of natural family planning. These methods require you to keep track of your menstrual cycle to determine the days that you can get pregnant. The difficult part is determining when those days are. We give you a few options to monitor your fertility and help you determine the days you can get pregnant. For women with irregular periods, including teens, this may not be the best option. 
Types of Fertility Awareness:
Standard Days (SDM): you can use this method if your menstrual cycle is between 26 and 32 days long. You will need to record your periods and determine when you cannot get pregnant.
TwoDay (TDM): for this method you need to observe cervical discharge to see when you are fertile.
Cervical Mucus: your body makes a specific goo when you are most fertile. This method is about tracking your cervical mucus.
Body Temp (BBT): for this method, you chart your body temperature every morning to determine whether or not you are ovulating.
Symptothermal: your body has many signs indicating that you can get pregnant. This method tracks several of them at once. This includes how open your cervix feels.
Lactational (LAM): breastfeeding naturally suppresses fertility. This method works if you have just had a baby. But for this method to work you need to be exclusively breastfeeding your baby.