Very much possible that you might be pregnant.. Check with a pregnancy test or go for a blood test..
Yes you definitely could be pregnant. Thats what happened to me. I had a wild night on october 6th, 2012 and i found out i was pregnant on October 19th after i missed my period and my nipples were super sore.. You should defintely go to the doctor.
The only way to be sure is to either take an at home pregnancy test, or a blood test from the doctor. Sore nipples/breasts are symptoms of pregnancy, but could also be an indicator that your period could soon be coming. But definitely take an at home pregnancy test.