opinions and explanations would be great

found out I was pregnant in February I had no idea as I was on the injection. Registered with my midwife and from my date of conception at the end of November she worked out that my EDD would be 15th August.

Then had my dating scan march 15th which said I was due early September.

Been having dating scans and baby has been measuring 2 weeks and 5 days ahead of where they should be for the EDD of September the whole pregnancy.

Would this all suggest that the due date in August would be closer to being right than the September one?