Spotting and Cramps during ovulation

Ch

Has anyone had negative OPK tests, but had light spotting and mild cramps during ovulation week. My CM is really light, but I think that's because I'm a little dehydrated. I've been testing all week and it doesn't seem like the color on the line is getting any darker. This has never happened to me. I miscarried in December and this is the first time I've spotted or had cramping.