Should I be worried ...

I’m 16weeks today ! I’m still not showing and I haven’t felt my baby as much as I do today . I was told my iron is low and that I didn’t gain any weight . I’m petrified that something is wrong ! I’ve called my doctors but he’s on vacation and my next appointment is this Wednesday . Any advice or words of encouragement ? Or should I go to an urgent care and have them reassure me everything is okay .