Measuring big? Anybody else

Anybody else measuring big ? I’m 26w6d and I’m measuring 28w3d. My last appt i was measuring 3 days ahead but at today’s appt I’m measuring way ahead 😩 how accurate are the sonograms? He is 2lbs12oz already ! I also did my glucose test so hoping for good results since they say sometimes when you measure big it could be gd.