Help sore boobs !!!

I got my period January 20-26 when I come on and before come on my breast are usually sore it isn't till now February 3 my breast have been extremely sore for the past two days I hurts wen I barley rub against them. I can't put on a bra and I'm having horrible back pains. Reading up about it it either says pregnacy or drinking al of caffeine looking for a second opinion because I am trying for a baby I've had sex on the days I'm ovulating and I've also drunk few cups if caffeine , can anyone help