Dr says messuring small @ 37.5 ?

Had an appointment yesterday. While they were doing the messuring from the pubic bone to top of uturus or whatever they had a hard time determining the measurement. After about 4 mins of poking and stuff they said he's messuring a bit on the small side. His bum was to the right a bit so they at first thought it was his position. Now I have to go in for a fetal assessment next Wednesday. Should I be worried that he's not growing anymore? And if they might induce me or something?