Irregular Cycles

Does anyone have any tips or tricks that worked for you to regulate your cycle? Mine has been irregular my whole life - anything from spotting for over month to nothing for 6+ months and everything in between. Doctors have done lots of tests, blood work, ultrasounds, etc. They can't find a reason for them being so irregular, so shy of birth control, they don't know how to regulate them.

Besides just being annoying, I need to get them regulated to hopefully have a chance of getting pregnant. My husband and I have been TTC for 4 years with no luck, and the irregularity of my cycles is 99% of the problem.

Any tips or tricks are appreciated! I've done diet and exercise changes, added in supplements, etc but will take ANY suggestions or advice you ladies have that have worked for you!