A lil worried!

Casandra
So i went for a check up today n had an ultrasound baby is fine n was super active it was too cute it kept pulling its feet to its face my emotional self started crying but anyways doctor says due to my last period i should be 14 weeks but only measuring 10 (shes not an ultrasound tech btw) when i went in on my first check up she said i was 9 weeks far n today was my 3rd visit ( every 4 weeks i c dr) when i went in i was @ 178 lbs today im at 165 but she doesn't seem concerned ive been high risk on all 4 other pregnancies so im concerned a bit am i over thinking or worrying about nothing or should i probably look for another OB?