Meet the Femometer: a smart device that tracks and predicts your cycle and alerts you when your body goes through natural changes. This smart basal body temperature thermometer syncs to your Android (and soon iOS) phone. It predicts when your period is going to start and offers accurate readings (within 1/100 of a degree).
Femometer has smart tracking algorithms that learn to detect small fluctuations in your fertility cycle and alert you. You can also use the device to monitor early stage pregnancy. Yet another interesting Indiegogo project.