Mez -
usually the doc will do what they call a Day 21 test to see what your progesterone levels are like, which will show whether you are likely to have ovulated that cycle. If you have ovulated and have regular cycles there is not much point going on Clomid.

There are SO many tests that can be done, but unfortunately there may be no actual reason found (as in my situation at this point!) and that is very very frustrating. I hope that you guys get some answers soon - or even better get a nice big +ve result soon instead!