I did inguinal hernia surgery 2 days ago and my right testicle pains me and is a bit larger than the left. also my hernia was also on the right side;?

Probably normal: Swelling in the groin, the testicle, and scrotum after inguinal hernia repair is very common and should get better day by day. Try elevation and ice/heat. If the pain is persistent and/or severe or if the swelling doesn't get better there is a small chance of damage to the spermatic cord. You should see your surgeon and monitor closely.