Feel like baby looks small

Al

I keep seeing 13 weeks ultrasounds and my baby looks small and undeveloped compared to them . With my daughter her was very clear and she was bigger. Doctor and ultrasound tech didn’t say the baby was measuring small they said 13 weeks but baby looks so small . Ultrasound tech didn’t show me legs or arms or feet or anything just one shot of the baby . Do you think ultrasound tech just do a bad job?