ovulation confusion

MB03
So on the <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> appt my ovulation windown was from day 13 til 19 and on Glow appt from 15 til 22. I dont really know which one to follow ibeen ttc since sept. I got pregnant and MC at 6 weeks in December. Please help. I know ovulation start 14 days before af, but still confusing.