Need someone's insight?

Hi, I've been TTC for well over 2.5 years, I was tested for everything from bloods for thyroid to internal US for uterus lining/cysts etc, Dr picked up my thyroid and is now under control (1.9), my fiancé was tested and his swimmers were 100%. I've tried everything from acupuncture (which I regularly do, yoga, natural herbs, etc) I most months get a positive opk and I temp'd for months and almost always O'd. I've always got on time periods (28-30), I ALWAYS have sex on the "right" days etc, BUT NOTHING, not even a late period.