Insides of clearblue digitals... Have you?

I know your not suppose to open them up so don't remind me but I did and although the result was negative I looked online for the line details and found that there should be no third line is no hcg is detected, so is it possible that I'm pregnant but levels are just to low still to give me the " pregnant" have you had this and been preggo or not preggo ? Thanks 

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