When to test?

Glow shows today as af is due. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Period tracker</a> shows I’m a day late. I’m pretty regular 28 day cycle. A few days before af is due I have spotting only spotting I’ve had was at 10 dpo only once when I wiped. This month the only thing I have noticed was sore nipples