Eh don't worry lah, BTL caesarean mummy pun period biasanya memang boleh irregular dulu, especially dalam first year or so, a few of my mum friends went through this jugak. Tapi kalau dah lewat berapa minggu, better do a test or see your doctor quickly lang, lepas tu ada peace of mind, sebab yes technically boleh pregnant lagi after BTL tapi very rare. Ini bukan something to stress about alone, doctor can confirm in 5 minutes je!