I cut my foot on a nail. what to do?

Nail wound: Persons who have completed primary immunization against tetanus, and who sustain wounds which are minor and uncontaminated, should receive a booster dose of a tetanus toxoid-containing preparation only if they have not received tetanus toxoid within the preceding 10 years. For tetanus prone wounds (eg, wounds contaminated with dirt, feces, soil, and saliva; it is 5 years.

Seek treatment: If the cut broke the skin and creatied bleeding it needs to be cleaned well. You need to make sure that your tetanus shots are up to date. If not you need to see a doctor for proper treatment.