Oo mama, totally normal ang irregular period after c-section, lalo na kung nagbreastfeed ka pa, minsan delayed talaga or walang period for months dahil sa breastfeeding hormones. Yes, may possibility ng pregnancy kahit withdrawal method kasi hindi siya 100% effective talaga, kaya if gusto ninyong maging sure, better talk to your OB about contraceptive options na swak sa breastfeeding mo para peace of mind lang, no?