Faint line - scared

Nicole
I took a pregnancy test yesterday and there was a faint line. I took one this morning and it didn't really get any darker. How long does it usually take to start progressing very rapidly? I am 11 DPO so I am very early; I understand that. It just makes me worried that I'm going to have another pregnancy that's a chemical pregnancy. 😢😢  
UPDATE: it did get darker
This picture is from this morning 
The pic below is last night. Not that much color but I'll take it.