Hot Flush after Injection

Just injected my shoulder, blood came out which is unusual, about a minute later a seriously hot flush came over me, feeling groggy now, any ideas? I’ve used this same bottle before and it was fine

What are you injecting and how much?

Don’t worry about the blood, if you didn’t need to go to the hospital immediately after injecting, then you didn’t inject into a vein.

Test E, it was less than half a M