IVF consult

We had our consult with the head of the IVF clinic and put down our deposit for Feb/March. Everything went pretty much as I had anticipated except the Doctor said that we are on the edge of unexplained fertility since our 6 IUI's did not work. He made some suggestions on what we could do leading up to it but I'm still really scared that we try this and it still doesn't work. Then we will have spent that money for no reason. That's my biggest fear.