When (and how often) to take a pregnancy test on the mini pill?

Sarah • 20, cloth menstrual pad maker.
Hey, I'm going on the mini pill soon and I want to ensure I'm not pregnant even though I know I'll freak out if it gives me wonky periods like it's known to do. How often has anyone been advised to take tests? My lady friends say they've been given instructions by their doctor to test often due to no periods but how often is often? And when should I test if I never bleed again? Should I pick a date and do a test every month?