MyMonthlyCycles
MyMonthlyCycles is an online tool to track menstrual cycles. Members can track monthly cycles and related data, like PMS symptoms, BBT, breast exams, and weight.
MyMonthlyCycles calculators help to plan for cycle dates: next periods, ovulation, fertile days, and pregnancy due date, among others.
MyMonthlyCycles creates detailed histories to share with doctors and OB/Gyns.
The site also offers health articles and Q&A.
There is a free version and paid premium services from $7.99 to $22.95 for a 6-month subscription. Services include Ad Control, Premium Fertility, MyMonthlyCharts, and bundles.