Ay, first time I'm hearing this too, mama! Implants are supposed to be super effective, kaya rare talaga ang ganitong cases, but if you're actually pregnant while using one, definitely check with your OB asap para ma-assess niya ang situation at ma-ensure na safe ang pregnancy mo. A few of us mums have had contraceptive mishaps before, and the doctors were always reassuring once we got checked, so don't worry too much pero priority talaga ang appointment, ha?