I'm 20 &' I've been also been experiencing really tender &' sore nipples for about a week. My boyfriend &' I haven't been active for about 3 weeks now. I suppose to come on my period tomorrow. Usually 2 weeks before my period I experience pain in my side &' my breast does get sore. But this time it's not my breast that are sore, it's my nipples. It's becoming really irritating. I guessing it could be my period but could there be a possibly I might be pregnant?