My uncle had only one testicle and had 1 kid, but has tried w/ a different women for a few yrs and can't. But i will keep yall in my prayers and goodluck!!
My brother in law only has one due to cancer and he has been blessed with 2!
My dad only has one testicle and he had me and my two sisters.
If you think there might be a problem then it wouldn't hurt to get your sperm tested to be sure.
Good luck!
Here is a link to a site with a similar question to yours:
http://www.betterhealth.vic.gov.au/BHCV2/bhcarticles.nsf/PanelQuestionsByKey/PE437?Open
Hope that helps.