This question may be silly to some, but here goes. I had a vasectomy and currently do not engage in any activity of which to worry. But my experience with the operation was so unpleasant that I never returned to have it "checked" to make sure the surgery was successful. It's been a few years, but should I be concerned? How often is the surgery unsuccessful? Since I am not in a permanent relationship, the fact that I use condoms to prevent illnesses also prevents any problems with pregnancy. Yet someday I might want to actually take advantage of the vasectomy...
-- Painful Memory
You should definitely get it checked out if you are concerned. Although vasectomies are successful that vast majority of the time, they can and do sometimes go wrong. There have been numerous cases of men getting women pregnant after having the surgery -- much to their surprise.
I'm sure that you may have some painful memories about the surgery, but rest assured that checking to see if it was successful should not involve pain of any kind. It's a simple test to see the potency of your semen, which merely involves you depositing it in a cup to be tested. There's no probing involved at all.
I strongly urge you to go to a fertility doctor and get yourself tested. At the very least, you will have piece of mind.