Holy sh*t...you were an April 8th, 2014 applicant and you are already in Canada. Nice! We applied on April 8th, 2014 as well and we are still stuck on Application Received.
I don't understand why you won't just call the CIC....buddy you are in Canada now...just call or email them and 5-10 minutes you will get all your answers. Most importantly answers you can rely on....dependable information. Not this guessing game. My 2 cents worth on this question is.....that the PR card is valid for 5 years. There must be an expiry date on the card (may be at the back). Again its better to verify with CIC.
Here is their toll free Call Centre telephone number: 1-888-242‑2100 (Mon-Fri: 8am-4pm local time). Ask them you want to know the expiry date of your PR card. They will direct you. All the best!