When should i test ? 😯

Paeton • Married to my bestfriend, Navy wife & Enjoying Life! Mommy of girls ❤️
My AF was suppose to be here the 25th no sign of her. The the glow app changed it to the 28th still no sign I've been having light cramping here and there .. We've been TTC But I want to know when's the best time to take a test BC I don't wanna test to early and get a BFN ? Any help would be appreciated 😊