Could I be??

My last period was on January 17th, 2007 and I had unprotected sex on the 31st of January as well as Feb 3rd.. and for the past two weeks my breasts have been really sore and usually before my period they are not this sore and the soreness doesn't last two weeks..I'm also urinating more frequently and I've had mild nausea. My next period is due on the 17th of February.

Thanks for any help!!