Thin line- help!

[lemongrass]

Does the whole line have to be positive or is this pos? I've been having these for days and my temp hasn't risen! If anyone could help, that would be great! My chart is in my siggy.

 

[pink_bow]

I wouldn't say its pos yet but looks very close xx

 

[charbaby]

From what i have seen it has to be the same thickness and same colour or darker x