What do you think? Pos opk - late

Savanna
I am 8 days late, took a CB last sat and got BFN. Took opk with first morning urin, I got a smily - so I am fertile? Then I took another without first morning urine and NO smiley. I don't know if I am more confused about being fertile or the fact that there was a Smiley this morning and now there isn't. Need advice!