Testicle size normal or not?

Hello everyone,

First of all, I recently went to the pediatrician, and after examining my testicles, he told me I shouldn't worry about testicular cancer (I'm a hypochondriac). Now, my question: In everyday life, my testicles are generally larger, and the right testicle is significantly larger than the right. But after a shower, for example, they are the same size (due to the warmth). Is that normal? Because the right one is usually very enlarged, but it can also become smaller than normal.