6 week (maybe) ultrasound scare

Okay ladies I am in need of some support 😔 I am on vacation with my hubby and I got really really bad anxiety and felt like I had to see the baby and couldn’t wait for my first appointment. I thought I was 7 weeks 1 day so I booked a private ultrasound and just had it done. It was over the belly and she couldn’t see a heartbeat all she saw was a very tiny sac with a very tint little spec (baby) at the bottom. She said she thinks I’m maybe a day under 6 weeks and told me to come back next week for free and she would see more. She said there was nothing to worry about and I was just earlier than I thought. Well of course I am hysterical and so worried. Is this normal? Did this happen to anyone else? Was I foolish for going so early? There was definitely a sac in the right place and a tiny little baby in it but I can’t stop worrying and crying. According to my lmp I should be 7 weeks and one day but I got a positive opk on October 31st which makes me think I ovulated on November 1st or 2nd? And help would be appreciated 😥