opk question

Jennifer • Angel baby in my heart 27/01/017 married 01/03 rainbow baby in way EDD 15/12/2018
I have used opk since ttc baby number one. Used them first time and managed to fall pregnant but that was a mc
Now ttc again and using them. But i ordered ones off ebay like i usually do and had one left over from ones i had bought in a shop
The blue one from shop shows up darker than one i ordered off internet
I have no idea what one to trust now
Im just going into my fertile week. 
But since my mc af has lasted a wee bit longer than usual so im cd 9 cause its lasted nine days
But i would only last four days.
Any insight would be helpful  
I could say to my oh to bd everu day for a week but dunno if thats ideal since these kits are two different colours

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