If you have had normal cycles previously, then this is not normal. Emergency pill can disturb the normal cycle rhythm, but not for so long. You should consult a gynecologist for a physical evaluation and a blood pregnancy
test and a trans-vaginal sonogram. Absence of a period can have other causes apart from pregnancy, namely, hormonal
imbalance, weight disturbances, stress
, medications, infections and so on. Please use a regular form of contraceptive
to provide you double protection against pregnancy. Take care.