not showing much at 29 weeks, starting to concern me

Toni

i am almost 29 weeks and feel like i am hardly showing at all. this is my first i am tall 5'9 and am plus sized. i can still hide my belly in an oversized shirt, and maternity pants fall down. i know everyone

says that first baby and height affects it but still i don't feel like i look overly pregnant, like there are none pregnant ladies out there with bigger bellys. Most people are suprised i am due in December. Makes me wonder if babies growth is ok. My Ob says not to worry about my size bc baby is healthy. He has never measured my belly tho only felt around and used the dopler. guess there is nothing i can do about it. i hope im not the only one still not showing much. should i be concerned?