Do you trust clear blue okp?

jessica

Mine said high (flashing smiley) 2 days on the 4th and 5th . then solid smiley the 6th and 7th on Feb . AF is,3 days late today but BFN on test everyday . I took Clomid 5-9 as,well . Im thinking either (1) I olvulated later than opk says and not far along yet to produce hcg or (2) not pregnant and clomid delayed AF . Im normally 28 day cycle . today makes 31. So is it possible to ovulate way later than opk said ? if i did ovulate on the day test said i would be 14,dpo with BFN everytime :(