Safe? Negative? ?

Had protected sex 3 weeks ago. My period is a day late so I took a $7 test at 2 pm. Negative?

Ive been stressing out lately

App says im 3 days period. My last period was aug 15 and now its sept 16. One app says I'm one day late.

No unprotected sex, twice only and both with condom. No pms symptoms as well. Im freaking out thats why I bought a test. Am I safe?