Hi sis, best to check the enclosed instructions ng Althea or ask your OB directly kasi it depends on which week of your cycle you're on, usually after 7 days ng consistent intake ang protection na, pero some doctors say to wait the full first pack to be safe, lalo na if you want zero risk! One of my mum friends had to clarify din with hers kasi nakakaguluhan ang timing, so don't hesitate to call your clinic, they're used to the question, I promise.