I stapled my thumb. it went in probably about 2 millimeters. i had the tdap shot 4 1/2 years ago. do i need a tetanus booster now for this?

For minor clean wounds ( no rust) , the vaccination is most likely still effective. The wound if open or bleeding should be evaluated. Keep the area clean and dry. Watch for signs of infection. Bacitracin is often helpful. Please follow up.

Tetanus boosters are generally given every 10 years although if there’s a puncture injury especially not a clean one, it might be done at 5 years. So you should be good.