I don't know if any of you have heard of Chris Hatch's working hospitals, but I have tried the hack and it's really a very cool hack! It can be found here.
Basically it's a system that allows you to build a working hospital for your game. It even utilizes playable sims in the medical career and law enforcement career to work as orderlies and guards. I tested it last night on a pregnant sim of mine and this is how it worked: In her last trimester a new option showed up under emergency on the phone that was called "call hospital". A taxi came and picked her up and the hospital loaded like any other lot. The main key to the system is a placeable ambulance that turns the lot into a hospital. The ambulance creates two playable sims that you can control who work as nurses. When building the hospital you can set up rooms for townie patients to use so your sim isn't the only patient. You can create a working gift shop for visitors to buy gifts for sick sims. Family members of my pregnant sim showed up during visiting hours and bought her gifts and chatted with her. The doctor sim (who is a NPC) showed up a few hours before she went into labor. There are special lights that you can place in rooms where you want the labors to happen. She walked to one of my maternity rooms and was joined by the doctors, nurses, and her husband who all watched her give birth. After that I called her a taxi and when the house loaded, her and her baby both arrived home safely! The hospital has to be built kinda like a house since the sim will be there for probably more than a day. So they need showers, beds, entertainment. You can build a cafeteria and a cook comes and serves meals. This isn't only for pregnant sims, but also sims that get the flu, food poisoning, even sunburned! The only issue that I've run into is that the sim still looks pregnant and I have to figure out how to fix it.......but other than that, it's a really great hack! One of my medical career sims was on the lot as an orderly that I couldn't control and I had Tanner Knowles who is in law enforcement come in to patrol during the night! Awesome, awesome hack!