Hi, thanks for your question. I m glad to help. Thyroid problems are a very common cause of menstrual irregularities. However, it is always safe to exclude pregnancy first. Chances are you might have done the pregnancy test a little early, and I would suggest you run a blood pregnancy test to give a definitive result. In the absence of pregnancy, the thyroid disease is the most likely explanation of the irregular periods. With continuous and regular treatment of the thyroid disease, the menstrual period would normalize. However, also note that such delays in periods may also be caused by stress, sudden weight gain or loss, and sudden change in eating pattern which should ruled out. I hope I have answered your question. Warm regards.