Are these getting darker?

I think so I just needed another opinion!  Based on my LMP I should be about 5 and a half weeks. But when I went to the doctor yesterday they saw NOTHING on the US. I usually ovulate late and my cycle is about 33 days long so I'm thinking I'm still 4 weeks, almost 5. Needless to say, not seeing anything freaked me out a little so I am looking for reassurance.