When will glow tell me to switch to nurture?

Karrie
I've had 3 days of positives (vfl) and logged "pregnant". Period is officially late and when I clicked "period late" all it did was push it back 2 days. What gives? Should I just switch over to <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">nurture</a>?