Hi BlueMoomin,
The most common tests that tend to be omitted are:-
Adequate x-rays of the uterus which may show abnormalities not otherwise seen at laparoscopy.
Hysteroscopy - telescope inspection of the inside of the uterus which may occasionally show abnormalities not seen otherwise
Repeated sperm counts over several weeks and months to make sure there is no subtle abnormality
Testing the sperm in special media such as swim up testsvelocity testing. However, when they are done, they often uncover a hidden cause for the suppposed unexplained problem
Thorough hormone tests to detect abnormalities of male hormone or early falls in progesterone
Scanning of the ovaries to see if follicles really are developing and there are no sign of polycystic ovaries.
Who are you currently seeing - are you under the care of a gynae at a subfertility unit?.
They've only done day 21 tests, a HSG (well that is useful) and a couple of ultrasound scans for yourself. There is no day 3 (this is an important test as this would compare the level of LH against that of FSH) and thats an omission I'd ask about. LH and FSH are important as these kickstart the ovulation process. If these are out of whack (and charting is not totally reliable an indicator of ovulation for various reasons. For example you can have a temp rise in the second half of your cycle when an egg has not been shed) then the day 3 would show that. A day 3 test should be done as a matter of course.
Endometriosis deposits if they are present are NOT picked up on any ultrasound scan or blood test. It is usually diagnosed through laparoscopy (a keyhole surgery op). Common endo symptoms include painful periods, pelvic pain and/or deep pain during sex.
I don't think you're "unexplained" - I just do not think that enough tests have been done and they've given you clomid because they don't know what to do with you.
You need a diagnosis first and foremost and you will need to be persistant in order to get answers.
HTH
Attila