A bit nervous

I'm a bit nervous today because of a call I got at work. It was my Dr.'s office calling to ask me to come in. When I got all of the allergy testing done a few months ago, I found out that I had "Low Pneumococcal Titers" that basically means that I had low levels of an antibody that protects me from Pneumonia, Lung problems, Sinus problems etc... So, I get a shot....the Pneumonia Vaccine and that was suppose to "fix" my problem. That shot was a PAIN btw...it was the worst shot I've ever gotten (I could hardly move my arm for 2 days). Anyway, last time I was at the Dr. (Monday, April 30th) they took my blood again to see if the shot worked. So....like I said, today my Dr's nurse calls and says Dr. Dickey wants me to come in and talk with him about the results of my bloodwork. My appointment is at 2pm. I'm assuming it's not good news.....because they would not have called AT ALL if it were. I'm not even sure what he could tell me....I've tried to do a bit of research on Google, and I can't find anything that makes sense to me. I'll follow up on this post with what he says.