Ultra sound did not go great:(

I went for my ultra sound today and they kept asking me when my last period was and if am sure. They couldn't find a heartbeat at all and they think am 10 weeks today and they should see a heart beat. They told me to wait until a month and see if miscarriage happens but my husband doesn't believe it and says everything will be fine and he thinks it's too early to tell the heartbeat. I conceived on sep 17 tho I think because that's when I had a little pinkish blood. Just waiting I guess! I don't know what to think. I am