What's my chances on this ?? :(

Been ttc for 2years now no luck been put on Letrozole 2.5mg CDs 2/6 this will be my 3rd go feeling a little deflated ... Any way my lil girl is 6 I got     Pregnant 1st try using clear blue digital Opk haven't tried it for Num 2 only used line opks with no success I'm thinking about trying the Opk digital what's my chances 

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