2 faint lines on FRER but neg. on clear blue dig

sarah
UPDATE: I am pregnant! These were early tests and the line got darker as time went on. Thanks for the feedback! 
I've taken 3 tests today. I think there are VERY faint positives on these two FRER but then I did a clear blue digital tonight and it said not pregnant. I'm 3 days late and have cramping.
Am I pregnant? Or could this be false positive or a chemical pregnancy? I just don't understand why the digital would say no and these look like they say yes. Am I misreading these? 

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