After posting I went online and did some research of my own. I must say I was relieved at what I found out about plus size women and pregnancy. Thanks for the reassurance!!
Overweight women generally show later just because people think its fat but its baby too. I am normally around 180 lbs and no one could tell I was pregnant until around 7 months. Don't listen and Never compare! Your doc checks your uterus size on a regular basis after the first trimester or so...they would tell you if something was wrong. Nothing to worry about!
Try not to compare yourself to other pregnant women. Instead, have an honest conversation with your OB-gyn, if there any potential risks, he will let you know. And if he thinks your weight is fine, he will reassure you! No need to worry neednessly when pregnant!