This late in pregnancy your ultrasound will be more then likely one or two weeks off give or take the most accurate one is one done in the first few weeks all mine have been off give or take like two weeks first she measured big then she measured small if there is an issue on the ultrasound your dr would have informed you ASAP so don't worry :)
My lmp is 28weeks today u/s says 26+4. Im thinkin more of my lmp is right
I'm sure nothing is wrong.. but id like to know the same thing I'm just as off with the lmp and what the us says like you are. Just curious how it all works!