3 different due dates in less than 3 days

I feel emotionally exhausted and frustrated, though trying to remain positive baby has a good heartbeat. Went in for ultrasound measurements past Wednesday @ 9 weeks, then was told I was measured in at 11 weeks 6 days. originally the due date was around 17th of September, then she changed it to September 6. Went in for routine appointment today since I'm high risk and was measuring in at 15 weeks! My doctor was checking over and over as to be sure that's what he feels. Went to his office as routine after and was assigned a new due date for August 29th, because he said after looking, calculating, going over her measured me in at 13 weeks whatever days. Soo many numbers, so much confusion for this lady 😫 has this happened to anyone else?