i m 18 yrs old...on 20th april,2011,i was doing sex with out protection..but it was not properly...21th april,2011,my period was come...but i had a few knowledge about pregnancy,,for that i was taken unwanted 72 on 22th april..my period was stop in 3rd day...my nomal day of period is 23 in every month,,but still it was not coming...i also test pregnancy by preger news on 12th may..it was negative...i m worried why my period is delayed????...plzzz doctor help me...amake sahajjo korun...