Uy, this is really something best discussed with your doctor or OB po, kasi iba-iba talaga depending on the brand at type ng pills, some start on day 1, some on day 5, it really matters para effective. A few of us mums from our group have taken pills, pero lahat ng amin nag-follow ng specific instructions ng doctor namin kasi important talaga ang timing para hindi mag-fail. I'd definitely ask your OB kung kailan exactly dapat simulan mo based sa brand mo, okay? They'll give you the most accurate schedule para safe at protected ka talaga.