First day of my last period was january 1,2013 i had unprotected sex on the 18th and 19th.... This past week i have had headaches constantly and lower back and abdominal cramps feels almost like period and then today my breasts r super sore any suggestions on what can be goin on? Period not due til 31st??? Ive also been super hungry and eating everything in site which is odd cuz I've recently lost 45 lbs an had great self control?? Help!