I've done a lot of injections "first cycle was test prop", and they always go smoothly, never hit a vein. Last night I did an injection of cold test and EQ, I was really sleepy and didn't want to go heat up water to warm the oils. Mid injection I had a muscle spasm, re-aspirated and a tiny amount of blood came inti the syringe "less than 1 drop". So I pulled out changed the needle and finished shooting an inch over to the side. Just curious what went wrong. ???