Could I return to work after implanon fitting?

Ask your physician. Should be ok but depends on type of work and whether there was anything unusual during the procedure. Ask your physician.
Yes. Unles you had a very, very specific situation in your work, there should be no reason not to return to work very soon after insertion. This is a very simple procedure that is not much more than getting a puncture as with getting an intramuscular injection. If you had unususal bleeding, bruising or other complication, then perhaps not. It sholdn't be a problem.