Is it normal?

my period is supposed to be on yesterday but it is not! i feel like i can't stand my bf like i am acting cold all the time i started feeling this way like 2 days ago and i dunno why, we've been together for 6 months and sth and we are in love, we just had this huge fight on sunday and then he apologized and started treating me like a princess, but i am being so damn cold!! why is that? is it bcz of my period? :S plz plz plz help!