thanks Rob_ToRob_TO said:You don't need to inform CIC about pregnancy. Only if child is born, and then as long as child is Canadian by birth they only need to be added to "additional family info" form so it's a very easy update.
However if your first medical exam expires and CIC requests you to do a new medical exam, then you will need to defer the x-ray portion (which can be harmful to fetus) until after you give birth. Obviously this would delay your PR until after you give birth, so hopefully they approve your app before medical expires or can extend your current medical.