I had a laparoscopic appendectomy 3 weeks ago Thursday, and I am still having stomach pain. I hurt mainly around my belly button. Is this normal?

Post-operative pains. It is very normal to have pains at the incisions especially at the umbilicus after a laparoscopic appendectomy. As long as you have no other symptoms there should not be much of a concern.
??? Hernia. You may have a incisional hernia in the umbilicus. See your surgeon for follow up.