question!

Aubrey
Hi ladies! Here's a question for you: 
AF is due today. I am 100% regular (to the day, all the time). I've had literally no spotting, which again normally happens every time, and none of my normal PMS symptoms. I took a test yesterday (EPT digital) and it was a BFN
Is it worth taking a test again tomorrow or should I just wait a couple of days for AF to show up? 
Sorry if this is a silly question! My mom has been a labor and delivery nurse for 28 years and is a wealth of information but I don't want to ask and risk spoiling anything!