Any idea how prostitution works in this game?
Once you hit a certain level of lewdness, go to the area with the shop and head to the shop all the way to the left. You'll be able to go into the shop (she doesn't go into the shop if her lewdness is low). Make sure to interact with the door twice, then she'll open it. After that talk to the people inside (i don't know if this is required but you might as well do it) and then go to the back alley right behind the shop and enter said shop from behind. You'll meet a guy and be able to sell your panties, nudes, and a pic/video of the girl taking a piss. Each of these are locked behind you're lewdness, but once you do the action that gives the most money, someone at your school will be eligible for prostitution. [either that or you just need high lewdness and talk to people]
Plus some people will show up besides the restrooms and if you talk to them, they will fuck you in the bathroom and open up toilet prostitution. Besides that just talk to any male character you find with high lewdness and they might have a prostitution option.
i couldnt even find how to get pregnant.
Just keep getting creampied until the percentage beside your womb on the page that shows a breakdown of her body hits 100%. Though giving birth is the hard part since you need to pay the doctor in the hospital 100,000 yen to give birth and there isn't even a birth scene.