advice please...

so i am 38 weeks pregnant and i have been measuring 4cm big since i was 20 weeks. at 36wks i measured 40cm. at 37wks i measured 40cm still. and today at 38wks i mearsured 39wks...is there something that i should be worried about? i have to go back to the dr in 2 hours for an ultrasound. im nervous something is wrong.

has someone else expierenced this? advice please...

It's normal to measure big I am also but my SO is big so the doctor isnt concerned

i was just worried about measuring 39cm when i am supposed to measure 42cm...