OTC pills

i'm using pills from health center kaso naubusan ng stock from them, i will be starting D1 of taking pills tomorrow.

can i buy pills OTC? or can i start taking my pills ng late ng onti sa 28-day cycle ko? or should i rest muna tapos wait ko na lang yung 28 days tas mag D1 ulit para di alanganin.

nag regular period ko for 4 months now because of BC pills. hirap maubusan ng pills kasi without it di ako nagkakaron.