First time trying opks according to glow today is the first day of my fertile window. Don't know if you can see clearly in this image but there's a faint second line does that mean I have begun to ovulate ? Or does it mean it's a negative ?

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The test line has to be equal or darker than the control. This was mine today and classed as +

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It negative both lines have to be same dark color

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Thanks for replying ladies. I will continue to do the opks till I get 2 dark lines X

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Not yet, both lines have to be the same colour and strength. 
Once they are, you are ovulating.
Good luck, and have fun!

Let's Glow!