It's totally normal to see the hair shafts of the transplanted follicles shed after 2-3 weeks. The increase of density to the hair line comes in very subtle in appearance and growth can be seen just like any other area of the scalp. You will also notice that after about 3 months, the pre-existing hair surrounding the hair on the hair line is much longer in length.
Some of the transplanted grafts do go into a non-growing phase (dormant phase) due to trauma on the scalp. Every follicular unit in the donor area grows at a different rate there for a small percentage of the transplanted hair will continue to stagger in throughout a 12 month time frame. Hair line growth is really no different from any other growth region of the scalp besides the crown.
Please remember, that if a patient has a great amount of hair loss then has a hair transplant to increase density, the cosmetic change or amount of growth isn't as noticeable than a patient who had no density before hair transplant procedure.
DCJ, hang in there and stay positive. Patients should care for the transplanted grafts and limit extended sun exposure. I hope my words were helpful?