hi, i am 20 years old and the last time i had a BC shot was July of 06. (it was good for 3 months) I had my period in the beginning of Jan and on the last day of my period (jan 10), i had unprotected intercourse. Well, my period came AGAIN about a week later. The past couple of days my nipples have been sore and I've been more turned on than ever. What could possibly be going on with me?