Trying for years with no detectable problems??

Hi -- I've been trying to get pregnant on and off (never preventing, some months more diligently tracking than others) for 3 years. We've been tested, DH and I are totally fine.. I even did the test to check if my tubes were open (they were, and yikes that test was painful!). I know others experience unexplained unfertility... Want to vent with me? or Anyone else been trying for this long and finally succeed? Tips? ???