Just had 5th pin, went in ok, upon pulling the needle out i got a big squirt of blood out with it, i know i probably went through a vein on the way in but its a little freaky, not really a big deal just first experience with that, other pins went in and out smooth as can be. I aspirated though so im pretty sure the gear didnt go in a vein but now it leaves me thinking: did i pull hard enough when i aspirated? am I 100% sure i pulled long enough to double check... little PIP but noting too bad. Again no worries just first experience with it.