I say try it first. If it's something to better improve your life, I would make sure you see how big your crowd is and average out what your total makings have been while doing so. In order to see if you'll be able to sustain such income to pay off all your bills, keep at least a part-time job and then cam on the side as frequently as you can until you have determined that the paychecks are well and can sustain you. Of course, when making camming your full-time job you'll make way more, but still. Ease in slowly in case anything goes wrong. You wouldn't want to quit your job and then worry constantly about camming and if you'll be able to pay next months bills (me. I made this mistake lol.)
As far as pregnancy goes, I feel there is a demand for such thing. Research good kink cam sites and start there. At least until after your baby is born ( congratulations btw! ). Just make sure you get to know what kind of crowd you'll be attracting and if it's comfortable enough for you, go for it.
Good luck, hun. I hope you find the best solution for you in the end.