You'll be fine. Compression shorts have the same effect on your sperm count as "tighty-whitey" underwear. Compression shorts CAN lower your sperm count by keeping your testicles too close to your core, where they can get too hot and kill the sperm.
Unless you want children and are having trouble conceiving, this is no big deal. You will still produce semenal fluid normally. This will NOT affect sexual performance and is absolutely reversible. Just don't wear the compression shorts when you want to have a child.