I am supposed to get my period this week. First I noticed that my breasts have gotten a little bigger, for the fact that I bought a bra that fit perfectly, and after a while it now doesn't fit very well (too small). Then my nipples got bigger. I don't mean bigger, I mean BIGger. It's almost like they are constanly hard with out me being cold or excited. Is this a sign of PMS? I have never had this before, I am confused. Help, what should I think of this?