Faint positive yesterday, negative digital test today??

Allegra • TTC baby #2! Baby dust!!

So yesterday I took a test and got a faint positive. This morning took the same type of test (cheap Walmart) and got another faint positive. Went to the store to buy digital so I could see the word "pregnant". Took it just now and it said not pregnant? Today is the day AF was supposed to come. I'm terrified now that it's a chemical! 😭😫 thoughts???