buffalo interview in two weeks, need advise

[mmmadni]

Hi guys,
I have to appear for my immigration interview (family sponsorship) in two weeks and seeking any last minute advise.
I got the following documents,

1. marriage certificate
2. police clearance certificates
3. chat record
4. phone bills
5. gift bills
6. wedding photos
7. my wife(sponsor ) is pregnant so doctors letter indicating her pregnancy
8. medical certificates had been submitted at the time of filing the case in Sep 2010.

anything else I should carry along with me?

whats is the probability that immigration officer would issue the visa on same day ?

if I do not get the visa on the same day , how many more days would it take to get it?

kindly advise me and please don't hesitate to comment.

 

[CharlieD10]

Did you order your CAIPS notes so you get an idea of why the interview is required, or was the interview scheduled on short notice?