confused

Kirsten
Morning ladies
Well it is here in UK 
Currently 3.42am
So I took a pregnancy test last night what was pos 😁😁😁😍😍😍
Took one just now and the line is fainter....🤔
I thought it was meant to get darker especially with fmu
Is this normal or should I be worried 
Edd is 3rd October which if correct would make me 4 weeks today