2nd pregnancy and still not showing

No
I expected to "pop" earlier this time since I got pregnant after 6 months of giving birth to my 1st. But I'm almost 20 weeks and still haven't "popped" I don't even feel any movements yet. 
My tummy is just fat, definitely big but no bump . Is it because I'm overweight ( I weight 190, and I'm 5ft 8ins tall ). Starting to stress that my baby isn't growing as well as it should be 😐