Iam 27 years old i had period on april 6th later i had unprotected contact. I expect my period after may 6th but till now i didn't start my period .I went to hpt 2times but it results nagative. I gave birth to my son in 2005 dec.In 2005 march i missed my period then i went to hpt test after 2days its result positive.Iam very happy that time. Now iam not planning to have a second one so,i was little bit tense for missing my period. Back pain ,white discharge from virgina, leg cramps are there as before cycle starts. Iam not getting nausea,Then what may cause the delay of my period .Please any one help me.