İ had an ultrasound about 2 weeks ago. My reports said I was 12w 6d and the fetus measured crown to rump 10.2 ml. İ looked at the average size of a fetus at 13 weeks and It was about 10 cm... My fetus seems to be too small, should be concerned?

Ok I missing something, you are 12 weeks and 10.2 cm and a average baby at 13 week is 10cm
So at worst your baby is average ?

I guess I am not understanding your concern sorry?

My question is my baby is too small it measured 10.2 millimeters at 13 weeks... The average size for a fetus at 13 weeks is 10 centimeters... My baby is still in millimeters... Is 10.2 ml a very small size for a baby at 13 weeks?