Is the HPT for thyroid issues?
The prometrium might take a while to work; it can take two weeks at least for a period to come after progesterone is stopped.
But what the HPT is for, I don't know, unless you have thyroid issues. (You don't mean HRT, do you?)
Anyway, get back with your doctor or call his nurse, and explain what is going on and get your timeline straight. Also, if you are wondering if you are pregnant, take a home pregnancy test. It should be accurate by now.