Yep - I've heard too that they are inaccurate!

Check further down the list on the 3rd tri discussion okay - I'm sure there was another question similar to this one with loads of responses reflecting exactly what everyone has said here. Just more examples

My ob said at 36wks bub was 3.5kg but who knows what he'll end up weighing. Its bit of a guessing game & they can be way out...

Dont worry okay