I nicked a vein yesterday, it didn't shoot out but but a big gloop of it came oozing out. Wiped it, rubbed it down with alcohol and went to the gym.
No worries bro.
But you DEFINITELY should be aspirating. Have you tried lying down on a bed on your side when you jab into your glutes? I find I can reach around further and be more relaxed if needed, but maybe I'm just wierd.