Measurement of baby

Elizabeth • 👧🏼👦🏼👼🏼 TTC #4
I'm 23w2d however baby girl is measuring around 21 weeks. But, she officially weighs 1lb which is accurate for the 23 week mark. Anyone else like this??
My doctor said my due date is staying the same because in the second trimester you are allowed to measure 2 weeks ahead or behind. 
Maybe my little peanut is just teeny 😍