Is it possible?

I've always been about 40-50 pounds overweight my whole life. I don't ever remember me ever being "fit" or somewhat skinny,  I've always been curvier with big boobs, butt, and kinda big thighs. I honestly don't look THAT overweight which is weird. 
I'm now pregnant, I'm 12w1d pregnant, and after I give birth, I'm wanting to loose a ton of weight. Is it even possible for me to be skinny/fit? 
I just want a flat stomach. What would you recommend?