Need advice please!

Was suppose to start my period yesterday (Friday) but didn't so took a clear blue test this morning and come up not pregnant :(!
Should I test again or should I just except that I'm not pregnant:( 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors