You can discover your cycle with an ovulation test. Women trying to get pregnant use them to find their most fertile time. They will tell you that point in your cycle.

Some women develop an allergy to the eggs that need to be absorbed rather than expelled. This can happen to women with tubal ligation. The same happens to some men who have vasectomies. Some immune system testing may be worthwhile. Inflammation from immune reactions could be an issue.

Have you found any doctors who are willing to think outside the box ? It may be the key to understanding your condition.

My best to you.