Hello girls! Had an ultrasound. They put the due date at 9 weeks. I li…

Hello girls! Had an ultrasound. They put the due date at 9 weeks. I listened to the heartbeat, everything seems okay, just a slightly elongated shape of the fetal sac. The cervix and uterus are fine. He said it's a small risk, so just take some rest, drink vitamins and magnesium. Has anyone experienced this? I haven't seen a gynecologist yet, the sonographer is himself a former gynecologist, and he looked both vaginally and in the abdomen.