How far along am I? Why is sac measuring bigger?

Priscilla • Mummy to 2 beautiful boys, ttc our 3rd this year but had 4 miscarriages, finally got another BPF in November and we are due our baby mid 2015 :)
My last period was the 27th of October, I have 22 day cycles, I found out I was pregnant last Tuesday. I had a ultrasound yesterday I should have been 4 weeks and the ladh didnt need to do a transvaginal ultrasound she could see the sac clearly measuring 5 -5 1/2 weeks, everyone is staying its strange?!

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