Chemical?

I am suppose to start my period on the 7th (Aug). I got a positive on a test on Friday (28July). The first(top) test seen on here was the morning of the 29th, The second on the 30th, The third was taken yesterday afternoon (31st). And the fourth taken today (Aug 1st). The lines are seeming to get a little lighter each time and I’m freaking out thinking I could be having a chemical. I would be a little over 3 weeks currently. Anyone else experience this?

Edit to add** I cannot just get an appointment with OB. Currently a 2-3 month wait for just a consultation. Husband is military and they decided to change the system.