When to test?

Yesterday was when I was suppose to start my period according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>, Glow says today though. Still no sign of it though! My breasts are tender, and I’ve been cramping very lightly (especially in the middle of the night) on and off for about a week. I haven’t taken a test yet because I’m nervous it’ll be a BFN. What do you think? Test now? Or wait until I’m a week late