I am on the cezeratte mini pill and i dont get regular periods i consulted my doctor about this and he said?

I WAS ON THE SAME THING FOR A LONG WHILE AND IF TAKEN BANG ON TIME YOU SHOULDN'T WORRY BECAUSE YOU'RE NOT PREGNANT.YOU CAN TAKE THE TEST ANY TIME AFTER YOUR PERIOD IS DUE.BUT IT ALSO DEPENDS ON YOUR SYSTEM BECAUSE SOME PPL DO NOT GET THE PREGNANCY HORMONE AT THE EARLY STAGES,BUT IF THE TEST KEEPS SAYING THAT YOUR NOT PREGNANT AND YOU ARE WORRIED THEN ASK YOUR DOCTOR FOR A BLOOD TEST.