By thinking as safe time had an unprotected sex on my 27th day of cycle (june 17. I took i-pill at the end of 3rd day (june 20) after sex. Last period was on may 19 ,so it is possible to get my periods on june 17-20 (i always have regular periods of 28-30 cycle) .but after sex i'm menstruating not at all. Does this indicating the sign of pregnancy? I am 25 year old.