After wisdom teeth gum swelling and bump on inside cheek?

Had bottom 2 wisdom teeth out on Friday. That night I had what seemed like a canker sore on inside left cheek. Now past few days has been oozing puss and sometimes blood very, very little tough. Taste gross! And left gum around back molar just started swelling after face swelling is almost gone.

Why would gum start to swell up now? Any thoughts on this darn bubble thing on inside of cheek. Maybe I bit my cheek while still numb? But why would there by puss and blood the past few days?