Do you get separate certificates for CFI and CFII? I passed my CFII checkride the same month my CFI was to expire. So far I have only received a new CFI card in the mail. Shouldn’t I be receiving a card that says CFII on it as well, or should the card I received have read CFII? Are there two separate cards?
No.  Under ratings on the backside of the Flight Instructor certificate, it should say:

FLIGHT INSTRUCTOR

AIRPLANE SINGLE ENGINE, INSTRUMENT AIRPLANE.

This is a CFI, CFII Flight Instructor Certificate, assuming you did your training in the United States under the FAA’s system.

You should see the same ratings on your temp certificate as well.