Hi,
I am not sure whether they would give you the visa. Once I phoned the cic here and they said that they are very skeptical about employing relatives as a live-in-caregiver. But you know, never know until the papers are processed. It depends on a lot on the immigration officer. Do they know that you are pregnant?
If you get here, you have to make sure you have the OHIP card (health card )otherwise delivering a baby here in Canada is around $10,000. It takes 3 months to receive it, after you get here. So make sure you have it, otherwise it is going to be a lot of expense for you right at the start.
Good luck!
Susan