Mama, that's a great question to ask your OB directly kasi talagang depende sa kung anong type ng contraceptive and kung gaano kaaga ang gusto mong i-start! Meron kasing iba't ibang rules depending sa injection type and your doctor needs to check kung safe para sa'yo based sa medical history mo. One of my mum friends started hers right after giving birth pa lang, pero may iba naman na hinintay pa ang first period, mas better talaga na clarified with your doctor para walang hassle later!