Pretty sure I've had measles shots, just in case, am I out of the woods if no fever, cough, runny nose, red eyes 15 days after very low risk exposure?

Out of the woods. 15 days out and no symptoms..I say you are home free.
Close but not quite. The incubation period for measles is 7-21 days, so you have about 6 days left before you can definitely say you are out of the woods regarding coming down with it. Luckily, you think you are immune and you feel it was a low risk exposure. I'd stay away from unimmunized people like infants for another week.
Measles. Measles is highly contagious and can be spread to others from four days before to four days after the rash appears. Measles is so contagious that if one person has it, 90% of the people close to that person who are not immune will also become infected with the measles virus. see here http://www.cdc.gov/measles/about/transmission.html.