is a progesterone
tablet, prescribed by doctors to help prevent miscarriage
. This is unlikely to cause any problems by itself, as long as you take it exactly as the doctor has prescribed.
If you have regular 28-30 day cycles, you seem to be late for your periods by a few days. You did not mention if you got your periods on 30th November, or you were expecting your periods then.
If you are late for your periods, please do a pregnancy
test to confirm pregnancy.