Here's my experience: I started using Minoxidil 5% and Propecia around Thanksgiving 2005. Four weeks later was my birthday, and I was almost in tears... I had shed so much hair, I felt I looked five years older than I did the month before. I thought for certain I had made a mistake, but a few people here encouraged me to continue.
Man, am I glad I didn't quit! Within 2-4 months my hair loss had stopped, and actually began reversing. By six months, I noticed definite regrowth. Right now I have much more hair than I did when I started treatment... I couldn't be more satisfied with the results.
I have no idea if your results will follow the same pattern, but I suggest giving it a few more months to see if your hair loss stabilizes/reverses. Good luck!
Mike