Hi mama! Breakthrough bleeding is actually super common sa first month ng pills, lalo na kung baguhan ka pa lang, so don't worry too much, marami sa amin na nangyari yan at normal lang talaga. But since you're breastfeeding at gusto mo ring malaman kung okay lang talaga sa baby, mas better kung mag-check ka sa doctor para ma-confirm na side effect lang siya ng pills at wala kang ibang concern, especially since you just started. A few of us mums also asked our OB kung ilan weeks bago fully protected na tayo after starting, kaya good idea rin itanong habang nandyan ka na. You'll feel better once ma-clear ng doc na lahat's good, promise! Sending you mama strength, first time is always worrying, gets ko yan.