Contraceptive

Hello mommies! Ask ko lang kung pwede na magtake ng pills kahit di pa bumalik yung menstruation after manganak? My baby is already 3 months old and I stop breastfeeding pero minsan pinapa dede ko pa rin siya like pampatulog lang. So i bought pills for lactating mom but the direction says "start on ur first day of menstruation". Thank you po sa sasagot ???