Incorrect feedback on fundal height

Lauren • 37-yr old wife to Justin and mom of two! Airbnb host, ad sales lady, carb enthusiast learning to play the piano.
I'm just over 10 weeks today and went to the doc today. Baby measured 4.3cm. Doc said I'm measuring one week ahead (large). When I entered 4cm into the app and it told me my baby is small. This is not accurate and if anything would freak somebody out.