Am I pregnant? Do I test again?

Mariah
Okay Ladies, So I'm late on my period I've had to push it back 3 times on here. Glow said it was originally supposed to start on the 12th. So I took a test on the 14th and it was negative. My periods are never late. And if the are they're never this late. Should I take another test or wait another week? I'm scared to get another BFN.