So latley my periods been really irregular, and I only last for 3-4 days from a regular period that used to be 5-7 days. Ive always had unprotected sex with my boyfriend , always. I was scheduled to start my period yesterday (6-3-12) but it never came? Ive had sex (5-25-12 through 5-27-12) then three days later , (5-31-12 through 6-3-12) ? Today's the Fourth ? Give me answers please .