Freaking out

So I went to my first ultrasound today. Based on my period I should be 9 weeks. But I did also take a test November 1st that was negative. My first positive was November 25th. My ultrasound only shows a sac. I have had a missed miscarriage before so my anxiety is so high right now. I was told next week I can have another ultrasound and I should finally see baby and heartbeat. But my family is started to freak me out saying that I should have seen something. I just want to curl up and cry. I don't want to go through another miscarriage again.