Strained testicle ?

Stashia • Stashia 🧡 Married 10.18.14 💍 3 children 🧑🏼09.30.08 👧🏼03.13.13 👦🏼03.23.16 🧡 American Bullies 🐶
My son is a month old today. Last night before bath I noticed his right testicle was a little swollen and it's a little more swollen today. He doesn't have fever at all and it doesn't hurt him when I touch it or wipe him. Has anyone else had this happen ? He has a dr appointment Monday but I didn't know if I should be concerned about it enough to call in the morning.