Measurements all over the place (dating)

I had my checkup with a ultrasound at exactly 27 weeks yesterday.

But because of national holidays where I live, I couldn’t do my checkup on a Monday like I usually do meaning I saw a different doctor than my normal doctor.

This doc seemed nice enough but I was underwhelmed by the ultrasound, he kinda rushed it, the measurements showed different dates and I didn’t get a good photo at all.

With the different measurements all he said was “baby is a bit small” and didn’t go into much detail on the meaning behind the different sizes or bub being “a bit small”

Has anyone else had various dates for measurements from a ultrasound????

I am literally counting down the days till I can see my normal doc on the 20th