Thoughts?

Hello all,

I had unprotected sex August 14th (Only day, didn’t have sex on multiple days) my period was due August 28th and it never came. Today I’m exactly 7 days late and I’m still getting negative tests, I figured if I were to be pregnant it would show up by now right? It’s also been 3 weeks since I had sex.

But then why hasn’t my period shown up yet? This is so confusing!!! When should I just rule out that I’m not pregnant or should I test again?

Thanks,