Hello - So you have not had a period for more than half a year (March - October)? If this is the case, then you should consult with your physician. Norethindrone is a progestin and can cause some irregularity of periods for 1-2 months after stopping it. But it would not be expected to stop it for half a year. If you have been under a lot of physical or emotional stress, that can interfere with ovulation and regular cycles. Your doctor will take a history and may give you about a weeks worth of daily progestin such as Provera. After completing it, in a day or two your period will likely come, if you are naturally making enough estrogen. If not, then your doctor may request blood work for endocrine related tests.