Period Tracker (iOS and Android versions) now feature an TTC Mode.
To activate TTC mode, go to the app’s settings and turn on TTC mode. Advanced TTC mode will activate several features within the app to help you track your journey to conceive.
The Add Note page will contain further features, including BBT, OPK, Pregnancy Test and other options for you to track. Also there’s a quick link to a BBT chart to view your temps and ovulation.