for the familyfunds cheat, try
familyfunds *family name* *amount of money* (example: if the family name is Hanson, and you want to add 500000 simoleons, write
familyfunds Hanson 500000 in the cheat window)
It will only work in neighborhood view.
the "bigger pregnacy belly" will only show with the clothing meshes it's made for, and when the sim is naked (if you use the showerproof skintone). You must download and use the "bigger belly" clothing too if you want everything to show properly.
You could try
this, though. It gives pregnant morphs to most of the adult female maxis meshes. Some of the outfits will show with conciderably bigger bellies than the original outfit (especially when the sim is fat). They also works on downloaded clothes that uses the same meshes.