I don’t know if the premium version already does this, but I track my cycles in Apple Health, and it would be helpful to be able to import the data into Migraine Buddy rather than manually setting the dates again within the app.

Thank you for your suggestion @Nova.star.93 :)
We do not import period data from any third parties at the moment

Yes this would be a good feature to have it gets tedious to keep in putting the same data into different apps! Just copy it from the health app. Make things more simple for us.