My situation is me and my husband had unprotected sex with pull out method(he didn't ejaculate in me) on 13th morning and 14th night of this month, and my period was due on 13th feb, i mean i had periods on jan 13th and was expecting the same in on feb 13th too, since v had unprotected sex exactly on 13th and 14th of feb i did not get my periods till 17th of feb, then i took plan b on 17thfeb noon(thinking m within that 72 hours time frame)and now m waiting for my periods to come,i have no side effects after taking plan b,no symptoms of pregnancy and no sign of periods y m i not getting periods? what are my chances of being pregnant? i have taken home pregnancy test but it says negative,since i have taken plan b already when should i expect my periods again? please help me..