I recently got my wisdom tooth pulled & was given amoxicillin. A few days later I noticed that my clit hood got swollen is it an allergic reaction?

Probably not. If just your clitoris became swollen, and there were no itchy hives or significant rash, i think it unlikely that an allergic reaction occurred, especially if that is the only symptom. Put some cool compresses on the area and see if the problem resolves.
Unlikely. The most common symptom of a drug rash, particularly to amoxicillin, is a rash that starts out on the trunk and spreads to the arms and legs. This typically occurs a few days into a course of amoxicillin, rather than in response to a single dose. If the swelling doesn't go away in a day or two, you should get examined by your physician or gynecologist.