question: ..I had unprotected sex 3 days ago and took plan b within the next 12 hours and then had more unprotected sex after. Does the plan b protect against the second intercourse??? I’ve also have had slight cramping, slight diarhea and a lot of mild heart burn and chest pain. I’ve taken plan b before and have never had symptoms before. Are these symptoms of the pills or is it possible the pill did not work?