Growth scan Question

Yesterday's scan at 30 wks she's saying baby girl is already weighing 3.5 🙈 I almost sat straight up lol I honestly don't no if that's good or bad she wasn't really answering my questions with my son last year he was 2.3  and they said he wouldn't be more than 7,5 at birth he was born at 8.5 so I'm nervous she will be a big baby as well anyone know if this weight is average ? Till my next doctors appointment where I can ask everything.