Tell me everything you guys are doing/using/taking gretta.
Has hubby had a sperm analysis? Would he be willing to? I had one person who couldn't get pg and we assumed it was the swaying, but it turned out her hubby was shooting blanks. This can happen even if you have been pg before (and for some reason I have it in my mind that this is your first baby??)
For frequency, I think you are best off doing the pattern of unprotected sex every 4 days and then one additional attempt at pos OPK. Two attempts (with overall pink sway) has gotten 65% success for pink and this number drops a LOT if you have 3 attempts (less than 50-50) so if there's any way to stick with the two attempts in fertile window, I think that's best. I don't think we're at the point where we are ready to go to SMEP, and this is particularly true if you are not doing diet any more. Gradual changes over time will enable you to get pg while still maintaining at least SOME sway tactics.
If you are already doing this, we have a couple options. My thinking is that it may behoove us to try using a little Robi/Muci and/or Preseed before adding attempts. People balk at that because they think these things sway blue, but 3 attempts sways blue too, so I think we have to at least be open to the possibility of trying to improve CM before adding attempts.