recon the nurse is rong with my dates

Louise
I am 5weeks and 5 days today I went for a internal yesterday she rushed my scan and says measuring 10mm so I'd say ur about 4weeks ! Am like no am well passsed my missed periods and there is two clear things in my picture ! Wish I would have quized her now  ! 10mm sack is ruffly 5and a half weeks ! Can Amy 1 help me  that noes wot thay are talking about x