@PhoebeMouse - when we begun TTC, my GP said try for 6 months, then come back for tests on NHS (I was already 40). I actually decided (on advice of friend who'd had fertility problems) to pay privately to get tests done earlier. If you're under 40, that's probably unnecessary.
Clinic did AMH (anti-mullerin hormone) and AFC (antral follicle count), both of which give an idea of ovarian reserve plus ultrasound scan to make sure everything in good working order. Some clinics also measure FSH (follicle stimulating hormone) levels as well, but mine didn't, not sure why.
I found out I was in good shape, ovulating normally and my AMH at 6.5 and AFC at 8 were above average for 40, but that still meant low fertility (range of values for 40+ women is huge from same fertility as late 30s to no chance of conceiving even with IVF). I was told I could conceive naturally, but chances were low i.e. 5-10%.
After no luck 6 months later, DP had semen analysis, which found everything good, except motility a bit sub-optimal. HyCoSy (that Mira mentioned which checks fallopian tubes for blockages) was proposed at one point, but didn't happen as we decided to move onto IVF (where tubes don't matter).
Clinic wouldn't have done HyCoSy before checking out DP. This is because it's a very low but not zero risk procedure, and if it turned out your OH had some problems, then HyCoSy might not be relevant and they would have subjected you to a procedure unnecessarily.
Update on me? Nine (!) follicles have developed (might not all contain mature eggs) and retrieval due for Friday morning. Strangely enough, I'm not stressed, but was getting a bit fed up of injecting myself (and Gonal F cost was bankrupting me
). There is nothing I can do now anyway; there either will be some good enough quality eggs that develop into 5 day blastocysts or there won't be.
If there are enough good embryos (more than 3?), the clinic will do pre-implantation genetic screening (the type that checks embryos are chromosomally normal) to find the best one(s). If there were to be 2 or 3 "best" ones, I'll be very happy
.