Leaving for Canada on a W-1 visa and I just found out that I am pregnant

[Gwyneth]

Greetings!

I know there  are numerous threads about being pregnant but I would like to share mine as I need advice from you guys. Kindly indulge me.

I got an offer September last year to work as a Manager. I was supposed to leave November 2011 but due to an error in my passport which I had to correct, my visa arrived January 26th 2012.

I am set to fly on Feb 13, 2012. However, I found out that I am 5 - 7 weeks pregnant already.

My questions are as follows:

1. Can Immigration deny my entry to Canada?

2. Should I inform my employer about my pregnancy?

3. Can my employer send me back home?

4.  My visa is W-1 can this be revoked on grounds of my pregnancy?

5. My visa is valid until 2014. I am not familiar with laws pertaining to pregnancy and coverage of Canada's health care system.

Thanks!

[Gwyneth]

Additionally:

6. I was informed that once I get to Canada, I can apply for a PR and I can get my husband and son so that they can be with me. Will my pregnancy cause my PR application to be delayed or prolonged or even denied?