Dannii,
My understanding is the luteal phase defecit IS treatable. If you have been TTC for some time without success then it's good to identify a reason and fix it. Some people have unidentified fertility issues which I think would be worse. There are hormone treatments available that should make a pregnancy possible for you - so YAY. Go back to being happy about detecting O and see your specialist about your luteal phase ASAP, AND BD away as you are ovulating!!!!!!