Seems to me that you have already checked for everything. if the doctors said that everything is well then what’s not adding up? And about the unexplained fertility. I do understand dear that technology has evolved a lot. But unfortunately there are things that cannot still be explained. I do have a friend who was going through the same. She had a fertility problems. But the doctors could not tell what the problem is. She moved from one clinic to another looing for help. But she found none. Then she decided to go for an option that would cover her. That is the frozen embryo transfer. So she never used anything of hers, And of course she was able to be pregnant. So for you, I think you should wait a bit. A year is still not over. If a year passes and a child is not forthcoming, then you can try other means.