4 months post hair transplant patch not grown! (Phoot)

Generally I would not worry at 4 months as sometime irregular growth occurs where one area grows faster than another area. What happened when you bled, did some of the grafts in this patch come out? You won't know for at least 3-4 more months.  

As hard as it is to wait and wonder, you really have no choice but to be patient and give yourself more time. Early growth is very often uneven but can even out over the course of a year. Then again, bleeding 12 days after surgery is not normal; presumably, you hit your head on something and may have traumatized some grafts. In the worst case scenario, if there is an area of poor growth at the end of a year, it would be a farly simple matter to address it with another small procedure.