Postpartum Uterine pain

Hi, ladies! I have birth to my son via csection on December 31, 2016. Ever since then, I've still had uterine pain when laying on my side. I did carry him very low during pregnancy, and I developed varicose veins in my vaginal area. They went away a few weeks after my son was born, but the uterine pain in still there when I lay down. I read online that blood is flowing to my uterus when I lay down. Is anyone else dealing with this, and has it gone away on its own?