8days past ovulation with no usual breast pain. what could this be. may be pregnancy or hormones?

Probably normal : It's probably nothing, just how your body responded this cycle. If your period is late, check a pregnancy test.

Breast pain: Breast tenderness does not always occur after ovulation. What stimulates breast tissue is progesterone and estrogen levels after ovulation. This cycle may just have had a low progesterone level, and at 31, occasional failure of a corpus luteum (in your ovary) to produce progesterone is not uncommon.