What could this mean?

M

So I'm in my fertile week, and yesterday was ovulation day. My husband and I did a BD, and later that day I had some mild cramping. Today however, I had some brownish discharge followed by light bleeding, with light cramping. After a few hours it went back to brownish discharge again. AF isn't due for another two weeks, and I've never had this happen before. Any of you ladies have any ideas on what this could possibly have been?