Uy, for questions about contraception effectiveness and pregnancy risk, kailangan mo talaga makipag-usap sa doctor or OB mo, sila lang ang makakapag-explain ng tama base sa timing at kung paano gumagana ang depo sa iyong body, kaya please don't worry and just book an appointment! A few of us mums have had different experiences with timing, so it's really best to ask a pro para sa peace of mind mo. Kung worried ka talaga, pwede kang mag-ask for a pregnancy test din while you're there.