hi, i am a married 28year female. in december i had unprotected sex with my husband twice. both the times i had taken i-pill within 12 hrs. now it has been 2months haven't got my period.i had gone to the gynec.pregnancy test was negative. dr gave me susten 200, for 5 days to start my periods. i am taken it. but i am feeling very drowsy, tired, and frequent mood swings.is it happening because of the medicine.