I agree with pp...
You should go by the ultrasound... and you should have gotten an anatomy scan at 20 weeks.....
Well, the 14 week ultrasound would be more accurate on dating than any ultrasound you would get now. Stick with the EDD you got from that ultrasound. I am surprised though that you haven't had an anatomy ultrasound done yet I would ask your Dr. why that hasn't been done. You shouldve had that around 20 weeks. Good luck and congrats.
the earlier ultrasounds are more accurate...I would stick with the first edd via u/s