Alamak, I understand your worry, tapi alhamdulillah baby okay dulu, that's the main thing! Honestly a few of us in the mummy group ada placental cysts juga, and most of the time they resolve on their own by third trimester or they're totally harmless to baby pun, tapi since this is something yang kena monitor, better you follow up with your gynae at the next scan to see if it's shrinking or staying the same, they'll guide you better based on the size and location. Jangan stress yourself too much lah, but do make sure your doctor keeps tabs on it during your regular checkups. Sending you calm vibes, mama!