I was starting an IV on an older lady who's veins would run away at the site of a needle. On the back side of the arm I finally spotted a straight blue line stuck it and successfully started my 2nd IV. I know wonder if I placed it in a vein or an artery bc it was about 2 1/2- 3 inches from where I saw a radial artey puncture. The blood was dark red and I did not notice any pulsating. Justt alittle worried. Any suggestions?