I am an 18 year old woman that just started taking Ortho Tri Cyclen almost 2 months ago, because I was having a lot of trouble with my cycle being regular. I have been experiencing lower abdominal pain at times. Usually bothing too serious, most of the time it just feels like a dull or achy pain, or like pressure is being applied. I have also been feeling tired a lot lately, my skin is dry even when I use lotion daily, and I have an increased sensitivity to cold. I have been previously diagnosed with hypothyroidism but now I am concerned that it is returning. What concernes me the most though, is that I have read that taking both oral contraceptives and a form of thyroid replacement therapy can cause the drugs to interfere with one another. What should I do?