Different body types and pregnancy?

I've seen various ppl that are thin gain pregnant and during the pregnancy they are still thin of late with a big belly & after the pregnancy they are also still sunken how do you know what type of person you will be? any a person that gain weight or stays scraggy? I'm thin a lil below average and i'm only wondering what will happen to my body if i ever become pregnant - how will i know what parts will win bloated and fat or if i will basically be thin throughout it adjectives? if you continue some brand of daily exercise while pregnant walking etc your body will tend to do better after if you just sit around like a hen on an egg, my first kid i sat around close to a hen on an egg i went from 96 pounds to 198 so ridiculous
i be 19 then 28 years ago i enjoy had 3 babies since and when i walk every day i simply gained belly and kept everything else nice
Do NOT verbs - it will come as a surprise to you and your body. As you know all the body types are different. so no further comments.