Help?

Wen is the best time to test if pregnant or not, my fertility days were from sep 7th-13th had sex sep 7th-23th except the 8 all they days he ejaculate in me, my next AF is the 26 of September (according to glow nd <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a>) if I test tomorrow would it be to early ? Any opinions....

Send me baby dust though???