Quantum Natural Family Planning Pilot

* The Mira fertility monitoring system (www.miracare.com) is a new home-use hormone tracking device with the ability to quantitatively measure reproductive hormones in the urine but is also synced to a smart phone App that provides a graphic representation of the hormonal levels throughout a menstrual cycle. * The Mira monitor will be compared to the ClearBlue Fertility Monitor for its ease of use, satisfaction, and accuracy. * The Mira hormonal monitor and App system has not been tested for its use in Natural Family Planning (NFP). * The Pilot study will involve current Marquette Method users who own and use a ClearBlue Fertility monitor and who will be asked to simultaneously use the Mira monitor for the sake of comparing the two devices. * Female participants invited to participate will need to meet the following criteria: * Age 18 to 42 years * Menstrual cycle ranging between 21-42 days * At least 3 cycles after cessation of breastfeeding * Not currently on medications that affect ovulation and 3 months prior * Not currently pregnant or breastfeeding * No known fertility problems * Not planning on achieving pregnancy during the 3 menstrual cycles of the study