Help! Positive OPK 12 days past ovulation

Alta

I’ve been doing OPKs and had a positive one October 26th. Been very crampy, headaches, a lot of CM and some mild nausea BUT I also know you can get all of these before your period. Today I took another opk because I’m feeling crampy again, like ovulation and it was positive. I’ve taken OPKs since the October 26th ovulation and a pregnancy test yesterday and they’ve all been negative until this positive opk today. What in the world? Help! Thanks!