boobs not sore??

I'm supposed to start my period today and it hasn't started yet, I'm not freaking out or anything about it because I think it will just start tomorrow if it doesn't start today. My question is though I'm wondering why my boobs haven't been sore at all? Normally I get very sore boobs around 7 days before my period sometimes even 9 days but my boobs haven't been sore at all which is kind of weird? Any thoughts on why they might not be sore? I did have unprotected sex around January 1st and I was supposed to start ovulating that day if I remember correctly, he did pull out and as far as a i remember nothing got inside me because he came on my inner thigh.