My one testicle is small

Yes, they will work. The size of your testicles has nothing to do with your ability to produce sperm. It is actually quite common for men to have different size testicles. While I am on the subject let me remind all you men out there that just like women must regularly examine their breasts for lumps, you must also examine your testicles for lumps. If you feel anything, don’t wait, but see a doctor immediately.