Light spotting-any ideas?

Hi there! I've got some light pink cm on "cd7" I've recently come off bc maybe 2 weeks ago? I had a withdrawal 3 days later which only lasted 2 days, and I haven't bled since  Sunday. Any ideas what this light pink cm might be? I took an opk and no Lh surge and I thought it would be too early for ovulation! I appreciate any advice!