Ay sis, possible talaga kahit breastfeeding ka at walang regla pa, ang withdrawal method ay hindi super reliable, lalo na kung irregular periods mo pa (which is normal after CS!), kaya hirap ma-predict ang fertile days mo. I'd really suggest you see your OB soon para ma-check kung pregnant ka na or para ma-discuss ang best family planning options for you habang nagpapasuso pa, kasi may safe methods na pwede mo gamitin; a few of my mum friends din had surprise pregnancies within the first year after delivery dahil sa irregular cycles, so better safe than sorry!