Had FUE 12 days ago and hit my head hard causing bleeding. What happens to my follicles now? (Photos)

if the injury was significant enough to cause normal hair loss, then you may have affected the transplanted hair as well.

From your photos everything looks okay. However bleeding might be a sign of damage. It is better if you consult with your hair expert. 

Bleeding in the recipient area can be a sign of lost grafts, but it is not definitive.  It is not possible to tell from the photos whether or not you have lost grafts, and the only way to really know is to wait it out and see if there is noticeable gaps in coverage once the transplanted hair begins to grow.

Since you were 12 days out at the time of the injury, the grafts are likely not significantly disrupted - usually after day 7 they are essentially grafted to the scalp.  The density of the red area appears to be similar to the rest of the grafted region, so it doesn't appear that you lost grafts at the time of the accident.  Time will tell, whether there is a going to be poor growth secondary to the trauma.  At this point, there is not much to do except to wait for full growth.  This will take the typical 9 to 12 months.  I would follow up with your hair restoration surgeon periodically to document and monitor the growth pattern over the next 12 months.

From the pictures, it does not look like you lost any grafts. At 12 days with all of the crusts gone, the recipient area should be relatively stable even with blunt trauma