First response vs clear blue

Emily
People I need your help. 
I went and did a test this morning first response one and it came up with one bold line and a very very faint line
I then went and brought a clear blue digital which came back not pregnant 
I got advised to take the test apart ( looked on you tube how to do it ) and there's to strips in there which show me this. Anyone know what this means? I've heard first response is very sensitive. And clear blue aren't. You have to look inside. 
Help help!! 
The second clear blue shoes yet again a very faint line.