What will happen to my pre-existing hairs after a hair transplant? (Photo)

I finally had a hair transplant about 10 days ago. It was about 4800 graft (that´s what the doctor said at least!). Does it look like one? 4800 grafts? Hopefully the grafts are securely anchored in and hairs are getting ready to shed. I had considerable amount of hair at the area of transplantation. I wonder what will happen to those pre-existing hair after hair transplantation. They were very thin and tender and I do not see any of them after the procedure. will they come back?