Please help!

Could this be ovulation related or am I totally out. I have not had a positive opk yet. CD 17. Cervix has been rising and softening as well as cm has been thinning over past few days. I was so sure o was coming. Today I have bright red bleeding/spotting. Id say heavy spotting/light bleeding. And mild uterine cramps. Not one sided. What is going on? I feel so defeated.