I am wondering if anyone can help!

As a 30 year old, recently I had undergone an inguinal hernia repair operation (open surgery both sides). But following the operation I noticed that one of my testical (the left one) hangs much lower than the other but no pain is detected. Could this be just a bruising from operation? Could my testical return back to normal? Or has the doctor stuffed up in the operation? I am very worried and concerned. Please help.