Hi, I Just Got My Wisdom Tooth Removed 3 Days

Hi, I just got my wisdom tooth removed 3 days ago and I think I have an infection. Since the day of surgery I've felt absolutely no pain but yesterday I opened my mouth and with a flash light I saw that I had white build up on the area where the stitches are. The tooth closest to where my wisdom tooth was, also has like a bloody blob inbetween it and the side of my mouth. I tried to brush it away gently with my toothbrush but it's stuck to my tooth, gum, and side of my mouth. The side of my mouth looks bruised. Infection???