Our dd took 5 years, ds took another 5 1/2. A couple of years into tryng the first time, I went to a dr who started with a round of tests just to see what was going on. Everything was normal. Then he put me on Clomid (looking back, I don't know why since everything was normal, but we were new at it then) I conceived the 2nd month on it, but miscarried. I couldn't take it anymore, and quit going to the dr. Another couple of years and I went to another dr. he looked over my old tests, again, nothing unusual in them. He decided to do a folliculogram--a daily sonogram of my ovaries just to see what's going on and if they are producing eggs as they are supposed to. I watched as eggs formed, one grew bigger than the rest and one day disappeared, was released. Dr told me about half of his patients get pregnant just from the help in timing. I didn't go for that, figuring we'd been trying so many years that surely it couldn't be that easy. Lo and behold, that little egg became my now 6-y-o daughter. I had hoped for an easier time conceieving the next one, but the same thing again. After a couple of years, went to the same dr. Didn't do anything drastic, spent one year with an ovulation monitor, keeping records and working on timing. no luck. In october of that year, I told dh enough was enough. i wanted the rest of the year off, then I'd go back to the dr for one last shot, do whatever he suggested but that I wanted off the roller coaster if it didn't work out. We quit trying and by christmas, DS was on the way. The only thing in common with each preg is that I had started exercising a couple of months before each one--I mean really consistently walking an hour a day and feeling better than i'd felt in a long time.
Good luck to you and let us know how things turn out!!