I am a little confused about my due date my pursuing month of pregnancy, my LMP was 11,Dec,2020 so, Dr is telling my 7 month has started on 11,June,2021 but according to my CEDD and my ultrasound report I am 21 week pregnant now, and my radiologist

told me that I am 6 month pregnant.

I am confused about my current month which one is more relevant? LMP or CEDD?