Anak, I know you're worried, 9 days is really nerve-wracking, lalo na kung regular ka talaga. But honestly, for something this important, kailangan mo talaga makita ng doctor or OB na, para ma-check properly kung ano talaga ang nangyayari with your cycle. Hindi ko pwedeng i-confirm kung anong effect ng Yuzpe or pill change mo on your body, kailangan ng professional para dito. A few of my mum friends had delayed periods after changing pills din, so it could be that, pero walang way para kami mag-assume. Please make an appointment na, ha? Peace of mind lang din yan, at makakasiguro ka ng proper guidance. Rooting for you, anak.