Flipping out being sent to a specialist

I got a new doctor when I came home to the U.S and had my 20 week u/s. They did not give me the tiniest inkling anything was wrong just said they couldn't get a good measurement of his head circumference and to come back in 4 weeks for another. So i did ..this tech seemed different didn't seem like she was being as forthcoming. Turns out both techs thought something seemed off and im being sent to a specialist! Supposedly his heart rate is fine and he is growing okay (his head measured small last time now measures right on time) but the techs feel uneasy about something with my fluid level or something like that. They did the Verify test today as well. Just praying and praying my beautiful boy is okay ...i kept it together in the office but started bawling when I got outside.My husband is still in Germany working which sucks I really wish he was here but at the same time I am glad I am home. I have been a nervous wreck because he hasn't been moving much so I thought seeing him today would make me feel better but now I feel worse. :-(