And my personal favourite pregnancy mod of hers, the pregnancy ultrasound mod. LittleMsSam also has a mod that stops the gender influence from certain foods, I know that in ts4 you can influence gender by eating strawberries to get a girl, I think, and carrots for boys.? Don't quote me on that, I'm unsure, but she has a mod that stops this influence so your sim can eat carrots and strawberries without it swaying the babies gender. I personally only use the add on to the mod that makes it able for pregnant sims in higher trimesters able to do stuff like yoga and working out, but it also has features like making the sims pregnancy bellies smaller and more, if you so choose.
LittleMsSam has a pregnancy overhaul mod.