About 20 years ago I was bitten by a dog and received the full post exposure rabies vaccine. 1 year and 11 months ago I had contact with a bat and received the two dose post exposure rabies vaccine. Well, I recently may have had contact with a bat again

Contact local agents. The rabies series is usually considered protective for 2 years from the primary or boosted series. Those working in high risk areas are encouraged to test after 2 yrs to see if their protection is waining. Your data suggests you may be protected, but your local authorities can review the issue and decide if your exposure was worrisome enough to treat.