What Causes Discoloration And Swelling In Knee Post Hip Replacement?

I had hip replacement on my left leg last Thursday this Thursday my leg started to change color around the inside by my knee my ankle swollen and it s changing to a purpleish blue I take two aspirins a day, I think it s 235 mg plus my regular medicine every day I m worried that I may be causing a blood clot I had the stockings on for three days but they seem to be cutting off my circulation around my five so I took them off