Opk question with bbt chart

So this month hubby and I decided to keep at it till the opk started to fade. So we got a cb dig + on cd 10 then on 11,12,13,14 today I thibk they are still postive.... Is that normal and do you think we should keep bd 
This is cd 12
This is cd 13 
This is cd 14 .... 
What do you guys think? Here is my chart