Both medicines may make your period not regular or disappear for a variable period of time. I am sure both medicines are important for you, and their benefits are far more than bringing your period. They make your period disappear because they increase the milk hormone, which affects the production of the hormones from the ovaries. Those hormones are good for your bone and health.
I am not sure what birth control methods you use if you need any. However you may use some hormone to have a regular bleeding and gives you the hormones you need, please see a gynaecologist to discuss that. Regards