Worried

SciAsia
Can anyone else lay on their back at 29wks and have a flat lookin stomach or its just me ?? I'm so freaked out and scared that my baby isn't growing because my stomach goes flat ! But I feel the baby near my belly button and my uterus also ! So I KNO its something there 😩 just weird to me my stomach isn't sticking up like reallllly noticeable even wen I lay back ! Wen I stand it's a nice size ! But I just hope my baby is growing  😩 I've gain 8lbs so far ! Doc said babies measuring like a week behind I guess ? In the 10 precentile and suppose to be in the 15th? But she said that's not so bad at all!