Stop by the doc on the day before and ask for a container. You can do it at home as long as you have it back to the doctor within the hour. If you do have to do it at the doctors office, just relax. You are one of many, many, many couples who have gone through that office with the same issue. No one else there will think twice about it. Best of luck to you and your wife. I sympathesize with what you are going through.
Saliva or other fluids alter the test results. A friend of mine found out the hard way and had to deal with the embarrasment of having the doc tell him that his wife's saliva ruined the test.
Why don’t you just go into the little room and start thinking about this thread. It would certainly work for me...
Yes, I will require at least 4 and no more than 8 girls outside my room watching football and cheering loudly, two mirrors, 1/2 roll of duct tape, 2 bananas and a girbil. Do not be alarmed, the gerbil only likes to watch. I will supply the Jaimie Lee Curtis True Lies naughty dance tape. Don't take it too seriously and you won't be as nervous.
Make sure to bust before she almost falls down or my laugh a bit too hard and forget what you were doing whats the 2nd mirror for?