The uterus expands through the pregnancy to help house the baby safely.
Organs shift within the body to make room for the growing uterus.
Blood volume in the body increases to keep up with the growing demand of having to grow the fetus and provide nutrients.
Lung expansion will eventually decrease and leading to shortness of breath on minimal exertion because of the pressure the placenta and baby will place of the diaphragm.
The kidneys will process tons and tons of fluid through at a more rapid rate because of the excess fluids from the mother.
Mom will have to pee a LOT because the pressure of the uterus and it pushes on the bladder, not allowing it to expand fully.
Mom will usually only be able to sleep on her side because the pressure of the baby can push on her aorta and cause her to lose consciousness because of lack of blood flow.
Interstitial fluid will build up within the feet and sometimes the hands.
The pelvic bones will begin to separate to prepare to engage the fetus.
Sometimes, linea negra will occur on the belly in a line.
The breasts will become enlarged.
You begin to lose some of your memory, called "pregnancy brain".
hCG levels will rise.
Since there weren't any options, I gave you most of the common ones people know. I can go down to the cellular level if you need me to but I'm not sure how far you are into it.
