Pregnancy test question....?

My sister took a pregnancy test today. She said she should be about 5 weeks. I am also pregnant and I am 5 weeks. My question is how dark should a pregnancy test be at this point? Should it be darker than the control line or not? By thw way she is pregnant just curious bout the lines. Also I know the lines vary in color but how dark is the line usually at this point??? Thanks in advance.