Eh rare je ni actually! A few of us dalam circle pun pernah dengar cerita macam ni, tapi memang very uncommon la, biasanya doctor can detect twin from early on kalau scan betul-betul. Most of the time kalau nampak single je, memang single lahir, tapi I guess one baby bisa tersembunyi di belakang the other during scan especially kalau positioning tidak clear. Honestly kena tanya your doctor about this because setiap case lain-lain depending on how the scan was done and positioning of babies, but I think your anxiety is valid, maybe good idea untuk tanya directly during your next checkup pasal the scan findings, just for your peace of mind!