TMI alert...spotting after sex?

TMI ladies.. Just BD'd and had this spotting on the toilet tissue after. On CD 17 now and got a +opk on CD 15 and 16. I thought it could be ovulation spotting ? Never had this before. I think I am/was going to O today even though my period is always 24-27days. It's a late O for me. Thoughts please? 

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