6 week ultrasound no baby

I should be 6weeks3days according to my last period (I know i ovulated about 4-5 days late so I should be at just a little under 6 weeks).

I had an ultrasound today and all she saw was the sac with a dot inside. She measured the sac at “about 5 weeks”. I told her i knew when I ovulated. She didnt have any answers for me and told me to come back in a few weeks. So frustrating, she wasn’t very informative and I felt that she was rushing... has anyone else been through something similar? 😞