Thank you for your query There are several reasons for not getting a period. The most common one is being pregnant so you need to do a urine pregnancy test if you haven't done so already even if you have used contraception of any form. Keep a period diary. If you miss another one see your Gynaecologist for some blood tests. Thyroid problems, early menopause are among the more common causes. There are rarer causes which your doctor needs to examine you for first. Best wishes