Sorry to see it looking so bad stacey, it looked like it sucked when you did it , but didn't look THAT bad: Well First of all, tetnus shot probably not. it is more of impact bruising injury, and it was a plastic pipe, not really a cut, more like a dent. As far as going to a Dr, you need to make that call Blondie! Now on the side . Did you treat that injury by going home and keeping ice on it and keep it elevated? I think I know the answer to that one.
Just my opinion, but I know what shape you were in the following day,
Keep icing and elevating it as much as you can, DR visit or not!!