I had one transvag u/s at 6 wks... heard heartbeat at 10 wks, go in for our next appt at 14 wks... and likely get our a/s done at the 18 wk appt...

I'm not high-risk, but can I request an u/s at my 14 w appt? I was so early on at 6 wks, that even the dr said that our edd could change; but we haven't had an u/s since...