You have to tell them if you got married, but it doesn't change your application. It is still supposed to be processed as a common law application if that's the way you filed it. I have read of case where they take the new status into account, but they're technically not supposed to. In your case, I doubt it will make any difference either way.
This is not correct. Common-law qualification includes a co-habitation requirement that "disappears" if the couple legally marries . . . because the marriage automatically makes the applicant eligible to apply to immigrate without the cohabitation. So if you got married, you'd notify them of the marriage and they would not have to assess the co-habitation as a requirement of your eligibility. The rest of the process remains the same, and the case would probably not be finalized any faster.
And no, if you got pregnant, there would be no need to resubmit his portion of the application. First of all, a child conceived by the two of you would be a Canadian citizen (if he is) and, secondly, there are no minimum income requirements to a spousal or dependent child case - so it's not like he'd have to suddenly prove a certain amount of income to sponsor a dependent. If you were to get pregnant and the child was born before your application was finalized, you'd want to notify them of the birth . . . but they would know (if he's a Canadian citizen) that the child would not need to be sponsored and it would only be a matter for informational purposes.
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