Blood clot from IV?

Has anyone ever gotten a blood clot from an IV? I had my baby 2 weeks ago and where the iv was There’s a hard lump that will get big and then go down when I’m moving around and I can feel where the needle was, it’s like swollen underneath the skin. I’m not sure if I should call my ob or my normal dr? Or even go to the ER?? I’m totally freaking out