joust go to 4chan.org, there will be frame on left (i dont like to give direct links withouth warnings :)) that says hentai alternative, thou threads come and go fast so i dont know if preggo is still on but im shure itll be up again soon ^^.
comment #4747 it's called google google 4chan and you CANNOT miss it, then it's just a matter of spending four seconds to find the linke to the alternative section