While it’s not forbidden by the Church to use hormones to regulate menstrual cycles, I would seriously recommend that you seek another approved method to assist you. The reason I say this is because I have what is known as Polycystic Ovarian Syndrome. I was diagnosed by my OB/GYN about 5 years ago and he put me on a regiment of birth control patches and Glucophage. They were supposed to relieve both the irregular cycles and the insulin resistance that often goes along with PCOS. However, after using the patches for a while and taking the Glucophage (or Metformin), I realized that neither was working and I asked my doctor for permission to get off of them. The side effects were not worth it.
Then, a few years ago, one of the doctors that works in my OB/GYN office wanted to put me on Yaz and Spironolactone since I complained about excessive hair growth (a common problem with PCOS–known as hirsutism). I took them for about a month and I notice that my cycles were getting heavier and more painful. Also, I experienced transient burning on my legs and back. The meds for PCOS were the only new things that had been added, so I took myself off of them and explained to my doctor that they were causing serious trouble.
Now, I refuse to be put on any birth control to “regulate” my cycles. It actually does NOT regulate your cycles–it only mimics it. It controls the symptoms but does not get to the root of the problem. Your best bet would be to see an endocrinologist and get tested for PCOS. There are treatments that are better designed than birth control pills that will actually get to the root of the issue. I would see one myself, but I don’t have health insurance.