OPK question

?Lois?
The bottom two were taken yesterday at noon and again at 6pm.  The top one was just taken today at 1030am.  I am currently on CD 25 and 6-7 dpo.  Could it be late ovulation or something else?  I also took a hcg test and it was bfn. I have also had minor cramping since 3-4 dpo, very mild nausea, bloating, irritable and woke up this morning completely famished!