i had a iv two weeks ago, when it was first put in and she tried to get none came out, then she move it around and got a small amount, and then the blood sucked back in, they push meds in to the iv and salin it hurt so bad they said it was the meds.Each time the salin went in it hurt so bad. The next day I had a great big bruse, now two week later I have a knot in that vain with a red line, my arm hurt really bad and my fingers a numb. Can this be a clot?