Paternity help

Hi ladies- please be kind as I am not proud of this.

My LMP was August 11-15 / cycles have been approx 25 days.

Guy A finished in me on 8/18 (very late) and 8/25 - finished in me both times

Guy B pulled out on 8/23

I did 3 Non invasive paternity tests with DDC.

Guy A at 7 and 18 weeks and came back >99.9% the father both times. Guy B came back 0% at 14 weeks.

When I went for my first US it showed a CRL of 7 week- saying i ovulated/ conceived on 8/23.

I got results I wanted I just have anxiety about all this and the accuracy and my CRL. Anyone have used ddc or know anyone who has??