Which due date should i go by?

So I had a miscarriage 15th of March 21 at 5 weeks

I got pregnant again straight after and got an ultrasound done at what baby was measuring at 7w6d which would make the due date 1-1-22 and I had an ultrasound on June 17th when i thought I was 11w5d and they have said my due date is actually 28-12-21

I don’t actually know when my LMP was meant to be because i never got AF before i got pregnant again

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