2nd lot of EWCM on CD 17 after already experiencing ovulation?

Ok, I'm confused....I had a positive OPK on about day 13 then thought I observed EWCM around 14/15. Then yesterday only a small amount of creamy CM (TMI sorry). BD'd on day 13 and 15. Then today which is CD 17 I saw what looked like EWCM again??? I'm confused? Does this mean I'm still fertile???