Gosh you poor thing, how awful for you, with baby due soon , it is paramount you eradicate your house of those darn pests fast.

I would consult a pest control expert, and see where that takes you.

As a matter of interest what flea product do you use on the pets, this can make all the difference, I use Advantage on both my cats, and have never had a flea problem since.

Good luck and I sincerely hope you find a way to solve this very upsetting problem.