I had unprotected sex with my husband a day prior to the expected date of menstruation. Menstruation was delayed by 3 days.the nxt cycle awaits 12 days.for the past 1 wk, I feel a bit giddy,feels like vomiting in the morning, there is severe irritation in the vagina and alternately i am either having food cravings or severe aversion towards food. Can there be a chance of pregnancy? Plz help.