The epididymi are weird things... I kinda prefer not to think about them too much. Their size / noticeability and relative hardness varies over time, to some degree based on how long since the last time you came. I learned that from my doctor when I was 18, as I sat on the exam table trying my best not to cry, having laid awake the entire previous night crying and praying and nauseous, totally convinced that since I had walked in the office for having felt a suspicious lump on a nad that I would be going home that day minus one or both of them--if I was LUCKY.
Honest truth: after the exam and his announcing I was actually healthy, I got dressed, thanked him, walked into the hallway, and fainted against the wall. Don't know if I hit the ground or not. I woke up in another exam room getting smelling salts and forcefed a Coke.
Quoth the doctor (again true): "I didn't squeeze you THAT hard!"