The date is already passed and it's been four days but yet there is no mensuration. What could be the reason for it? Before you answer this let me tell you last month it began on time and she was expecting it to start on the same date this month too, because as there was no sexual intercourse in the last thirty days or say in other words from the last time it started to this time she was expecting to start .Please answer. Is this a sign of pregnancy?