So confused...

PumpkinC
I've seen varying responses to this.  Do you count a D&C as the first day of your period? If not, how do you predict ovulation and your next period?
And:  how do I make Glow/<a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">Nurture</a> accurately reflect all of this?