I took urine prega test with prega news after two days delay of my periods and it was negative. Now I 'll take one more test in a week to reconfirm it. I was menstruating on 29th august till 3rd Sept but light bleeding. My regular periods are of heavy bleed. Actual date of periods is 4th. So I am getting confused whether they were my periods or implantation bleed due to taking of unwanted 72 on 11th august after intercourse.