Help! This may be a dumb question tho, lol!

Nicole • Married to my high school sweet heart (08•17•13) of almost 13 years. I gave birth to our sweet rainbow Baby Cade David on 11•30•16 and we are currently trying for baby #2 ♥️

So I know I’m pregnant, I had an u/s done on 7/12 but all they could see was the yolk sac, they said I probably ovulated late and my dates are off. By my LMP I should be 7 1/2 wks but am only 6wks 1d today. The doctor was worried about a chemical when I first went in on 6/29 bc my test was a weak positive so they tracked my hcg and it was more than doubling anyway, I’ve decided to keep testing at home until my next ultrasound this coming Wednesday to make sure my tests aren’t getting lighter/fainter (if that’s a word lol) I tested last night w a blue dye test it was all I had

The picture was taken at the 2 min mark the positive showed up instantly and I was very relieved to see a strong positive so I put it on the shelf meaning to put it with the rest of my positive tests and ended up falling asleep with my little boy and this am I went to put it with the other tests and this is what I saw

The positive is almost completely gone....is this normal? I know I’m probably overreacting but any advice or positive words would be greatly appreciated! Sorry this was so long! Thank you for taking to time to read it!