Conception dating

Conception dating help please...please be kind :)

LMP 8/11-8/15

Last 2 cycles prior: 25 days

Man A finished in me on 8/18 & 8/25

Man B pulled out on 8/23

Did 3 DDC noninvaisve paternity tests

Man A tested >99.9% the father at 7 weeks & 18 weeks.

Man B tested 0% the father at 14 weeks.

My fear is my due date is 5/16 which shows a conception date on 8/23. This was done on 9/27 showing | was 7 weeks, even though based on LMP I was 6 weeks and 5 days.

These are the results I wanted, but can I trust them. My dating scan scares me.