Aihhh jangan stress dulu mak, a few of my mum friends pernah dapat situation macam ni where one sac was smaller or wasn't clear yet, memang kena tunggu scan berikutnya je sebab sometimes the second one just needs more time to develop or it bisa turn out to be vanishing twin situation. Dalam seminggu dua lepas tu usually boleh dapat clearer picture, so jangan khawatir sangat dulu, just make sure follow up the scan appointment yang doctor set up okay!