Hi i think I have understood your concern. There are following possibilities- 1] Wrong dates ( but you are confident of dates) 2] Constitutionally large baby 3] USG machine data variations 4] Gestational Diabetes. I would like to know if the findings were same for USG at 6 to6 weeks or at 12 weeks gestation. It carries more importance. Please rule out gestational diabetes by doing 75 gram glucose load test. Do blood sugar levels 2 hours after glucose load, if above 140 mg% then start with diet , exercise and MNT_ medical nutrition therapy. please do follow up USG, at 4 weeks interval to asses growth parameters. I hope this answer helps you. Thanks Dr Purushottam Neurgaonkar