This is so similar to me. I coughed up blood my first week away at college (which is not something your mom wants to hear on the phone your first week away, as I'm sure you can sympathize...) and freaked out, it had never happened before. I called my doc, and they held my Pulmozyme and CPT for 48 (72, maybe?) hours; I got progressively sicker, and they put me on Prednisone for 6 days, because it kept happening. Not much, but it was definitely blood. It happened last Monday...and now I'm in the hospital, for the first time in my life, with an exacerbation.