Well, I have a bit of experience at this since I have only one fallopian tube, which doesn't work too well, and PCOS as well.
Are you are seeing an OBGYN who specialises in infertility, or a reproductive endocrinologist (RE), who only
What REs normally do is take a detailed health history, ask you about your periods (how regular are they, are they heavy/painful, do you have any bleeding between periods etc), ask if what contraception you have used, if you've ever used an OPK to see if you're ovulating, if there's any family history of infertility, if you've ever had any pelvic infections, how often you have sex .. just the usual stuff you would discuss with anyone.
Your dh will probably be asked for a sperm sample and I would expect the doctor to give you an ultrasound to look at your ovaries, and probably schedule some blood tests to measure your hormones if he or she suspects ovulatory disfunction. I knew I had a tubal problem but the PCOS was only diagnosed after my RE looked at my ovaries (PCOS ovaries typically have what's called a "string of pearls" appearance on ultrasound) and by my day 3 bloodtests.
The doctor may possibly suggest that you have an HSG (hysterosalpingogram) to make sure that your tubes are open and you don't have any uterine abnormalities.
If you've been charting bbts I would take your charts along in case the doctor wants to see them. I wouldn't worry about having to undergo unnecessary tests. There are lots of different reasons why people have difficulty conceiving and sometimes you have to have a lot of tests to work out what's going on. I know a lot of infertile women (in cyberspace) and it's the tests that were not
done, which should have been, which upsets them.
Now you're probably really freaked out! Honestly it's not so bad. You're probably dreading it, but honestly it's a big relief to go and do something about it when you've been ttc for a while with no result.
If you're worried that you'll leave out important information, write down on a piece of paper everything that you think might be relevant and take it with you. I tend to talk a LOT at doctors' appointments and ask a lot of questions, (I do it at the vet's as well!) because I want to make sure I know what's going on and why. The way I see it, my dh and I are working together with the doctor to solve a problem, and it's very important that we understand what's going on so that we can have confidence in the treatment.
Good luck tomorrow - let us know how you get on!