Family planning (good for 3months)

Hi mommies ask ko lang when is the time na mag make love with your partner after magpa inject, kakatapos ko lang kasing magka mens, and kahit na inject na ko good for 3mos, takot parin kami ng husband ko kaya withdrawal parin, is it safe kapag after magkamens and mag make love hindi mabubuntis? #momcommunity #advicepls