Hi Kel
I think it would be a good idea to get checked out ASAP. It sounds like you may have a bit of the placenta still inside you. However as others have said there are many causes of a high temp.
This what happened to me with DD and I had to have a curette to flush out the rest of the placenta - was not pleasant at all, go andhave yourself checked hun.

Personally I wont be leaving the hospital this time till they give me an US to make sure its all out, last tiem they even said the placenta was "intact".