I had an ultrasound but they just saw a sac??

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So I had a transvaginal ultrasound yesterday and all they saw was the sac with nothing in it yet she said I was 5 weeks and 5 days (when I thought I was 5 weeks and 2 days) and said nothing about a miscarriage or losing the pregnancy. Just said it was so early. Sooo..? It’s just normal to not see anything in there yet?