You don't need to send CIC anything about the pregnancy. Only things you need to inform CIC about are:
- if CIC requests applicant to do a medical but they are unable to do x-rays due to pregnancy, then you need to let CIC know why you are delaying taking it.
- when baby is born, can inform CIC of the change to family information.
For question on TRV, better to check the "Visitors" section of forum.