The day after is REALLY fast ( lice maybe? Phthiriasis or Pediculosis pubis link ) and "tiny bumps"? I don't know if they bite, they probably do under the "right circumstances". In any case lice are annoying but if it's that, your life is not really in danger.
Remember, I'm NOT a doctor! (and condoms don't help against lice. Shaving does, if its that!)