Free with in-app purchases, for iOS and Android
A period tracker is useful for women trying to conceive or to prevent a pregnancy.
Please subscribe or log in to continue reading the full article. Learn more about ST PREMIUM.
We have been experiencing some problems with subscriber log-ins and apologise for the inconvenience caused. Until we resolve the issues, subscribers need not log in to access ST Digital articles. But a log-in is still required for our PDFs.