Has this happened to anyone

On Monday I went to my RE, I was told baby is measuring 10 weeks 4 days. My due date is March 25. That same day I went to my first obgyn appointment and was told baby is measuring 11 weeks 4 days. They were able to do 3D ultrasound and confirmed measurements. And my due date is March 17. That RE has been measuring wrong. I don’t know how far along I am now for sure. I did fertility medications. Has this happened to anyone ? Any suggestions which measurements I should go by ...