I'm 3 months post PRK and still have 20/40 vision. Is it likely to improve?

I had PRK a little over 3 months ago and I'm still only seeing about 20/40. Have an appt with my dr in a few days but what are the chances this will improve? I've been pretty stable at 20/40 since about 4 weeks post surgery. What would be the reason I didn't get to 20/20? I was about a -6.5 before so I had pretty poor vision to start with. I'm really upset and regretting this surgery.