What is your latest EP? If you seriously want bumps for the Maxis-only clothes to make pregnant women look pregnant, then you can check out this pretty cool project over at MTS2 where The Mystical One has taken up the herculean task doing all of the clothes that came out since Sims 2 (original game) came out along with every EP and SP there are.
When you visit The Mystical One's
Adult Female Default Meshes with Pregnant Morphs, please read through the documentation thoroughly and note which EPs and/or SPs you have in order to download the correct files.
My latest is Apartment life and I did download mystical one's hack and got every ep. I suppose I should reread everything