should I be feeling movement by now??

Desss
I felt my son at about 12 weeks and he moved continuously from then, even pushing up on my belly while I'd lay on my back. But with this baby I've only felt movement once or twice and that was about 3 weeks ago. It worries me but ther ER nurses would look at me crazy if I came in and said that being so early.  But I've been really depressed and stressed waiting for my doctor to find my previous script for Zoloft & Atarax but she still hasn't prescribed me anything or let me know if the other doctor sent her the medical record. It is good to still check at the ER/Triage? Or should I just wait till my appointment in two weeks?
I know some people don't feel movement till later..