Hey sis, DMPA is super reliable talaga, like 99% effective pag on-time ang injections mo, so kaya mo yan! A few of my mum friends are also on DMPA and honestly walang issue kung consistent lang, pero if you're really worried or may irregular periods na, best talaga mag-check sa OB mo para peace of mind lang, they can do a quick test or just reassure you na okay ka pa. Pero seriously, enjoy lang with hubby, yan ang point ng family planning eh, to have peace of mind na!