Advice please :)

Kathy
Hi ladies,
Just wondering if anybody could help me out with something. AF is due in 3 days and I've read that opks can sometimes detect pregnancy so I've taken one this morning and this is the result 
Has this happened to anybody who has gone on to get a bfp? Should I take a hpt or am I reading too much into this?
Any advice would be greatly appreciated.
Thankyou :) 
Kathy 

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