You can use Standard Days Method (SDM) or Moon beads also known as CycleBeads a, color-coded string of beads to track your menstrual cycle, your fertile days (when you are ovulating) and non-fertile days (when it is safe to have sex if you are trying to prevent pregnancy). Moonbeads can be found at most pharmacies, drug shops, supermarkets and general merchandise outlets. If you have a smartphone, you can download this app from Apple and Google pay stores at no cost.