1st on Glow. Questions about all of this!

Courtney
I started glow with my last period beginning in feb 18th. My peak day was Sunday. My "genius" menu says today is 1 DPO. My period is due on 10th.  We are trying for baby #4. We have 3 girls and my husband wants a boy. So he really wants to save until peak day to give best chance for boy. We had sex on my peak day. When should I test since tomorrow is technically 6 days before period but only 2 DPO???