I took two postinor 2 tablets in one dosage and I saw my period later in the month as expected by the flow was very scanty and dark brown throughout the flow and it lasted for 4 days instead of the usual 5 days. Now I am due for my flow again and i haven't seen it and I am a week late. I am not pregnant because I haven't been sexually active. Please what is wrong with me? Or could it be as a result of the over dosage of postinor 2?