Does your breast soreness fluctuate on the pill?

Usually I get VERY sore breasts around "ovulation" or a little after. Sore and swollen where they hurt to go down stairs. This month I'm not sore really at all...(a little on the sides, but nothing compared to what it usually is).. Which is kind of alarming to me. I have never missed a pill and have been on Necon for 7 months now. Is it normal for some months to have super sore breasts and others to not have it at all? Anyone else experiencing this?