Chemical pregnancy

Well, I feel dumb. I got a few BFPs last week, got too excited too fast, deleted this app and downloaded a <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a>. :-/ Now, 6 days late, I just started bleeding, and my test is negative. Do you guys know how Glow deals with chemical pregnancies? I hope it doesn't make its calculations based on last month's cycle length, because 6 of those extra days were "pregnant" days rather than luteal phase days, right? What a bummer.