Ahhh I understand the worry! Honestly it happens lah, a few of us in my mum group dapat boy confirm confirm at scan, tapi keluar girl jugak, and sebaliknya ada juga. Scan accuracy tinggi sih around 95% especially kalau dah nampak clear burung, tapi baby position, angle, timing semua boleh affect. My friend's second scan confirm boy and memang boy, tapi her cousin dapat boy at 20 weeks then girl at 32 weeks follow-up, radiographer salah angle je. Either way, congrats on your second bub, boy or girl, dapat siapa pun akan jadi surprise yang best!