Help - nurture pregnancy calendar wrong?

Patrizia

Why is <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">nurture</a> telling me that I’m 6weeks and 1 day pregnant if it’s only been 5 weeks and 1 day since my last (first day of) period (Aug 10)? True, my cycles are short (21 days currently) and I ovulated early (around day 8 +/- 1 day) and thus compared to the 28 day cycle this pregnancy would be more in line with 6 weeks-ish, but still, how does <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">nurture</a> get this wrong or why? What’s the mistake or logic behind their calculation. I’d understand if it said week 6 or 6th week but not 6 weeks. Any ideas?