When will opk be postive ?

[ttc_Mera]

I'm cd 13 , usually I get my postive opks on cd14/15. I always struggle with getting a blazing positive with these cheapies ( compared to my fertility monitor I always get a peak around the same time each cycle ) so this cycle I'm trying to catch that surge!! Here is a pic of my opk I took around 8pm (est. it's 10:57pm now) . Forgot to by new opks so I only have one last one left , when do you think i should test again to see if it's a blazing positive . I think my surge come by quick and that's another reason why I can never catch it on these cheapies .

 

[ttc_Mera]

I got this , this morning. Opk still not blazing positive but peak for my clearblue fertility monitor .

 

[Xokittycatxo]

Well if I were you, I would go by the FM and just keep testing with the cheapies. I got my strong pos with the cheapie and first response in the evening around 7pm. My cheapies were still positive at 2pm the next day but def not as strong. What brand is that?