I cut my head on recipient area 5 weeks after FUE and there was a speck of blood, did I lose my graft? (photos)

If you cut your scalp and had some bleeding you may have lost a graft (or not).  There is no way to tell.  Losing one graft probably would not make a difference in the overall results.

At 5 weeks post procedure the chance of losing a graft would be the same as losing untransplanted hair from a cut,and that chance would be slim to none.

At this point your grafts are essentially as strong as your regular hair- so the only an injury traumatic enough to damage your normal hair would be enough to damage your grafts. Fairly mild injuries like this shouldn't be an issue (assuming your transplant has healed normally).