You can try contacting your MP (Member of Parliament) and see if he/she can be of any help to your situation. My husband and I are also in the process of getting him to Canada and I completely understand your frustration and anxiety. Unfortunately, the system is how it is and the chances of speeding up the process is unlikely, regardless of a baby on the way. If it were the contrary, don't you think there would be more women getting pregnant just so they can expedite the immigration process?
I do suggest though that you call your MP and see what help he/she can offer. It's a very long shot but I guess at this point you might as well try all your options. Maybe you can find an MP like this guy and who knows.
Bob Mills, Member of Parliament - Immigration help for our community.
Your only other option may be to move to the DR if you really want to be with your husband throughout your pregnancy. Just don't stress too much...think about the baby. I know it's a long process and there are a lot sacrifices you gotta make but like everyone keeps telling me, your husband will get here...
Good luck and I wish you the best.
Wendy