LouLou- I would definitely hold off from starting the clomid until you have seen or spoken to the doc. I would probably also do another HPT tomorrow....just in case.
If you get BFN (your temp sounds high...still could be a bfp on its way) and still no real AF, maybe you could have a scan to see what your lining is doing? Not sure if that's how it works though.
Goodluck