Moving Ovulation Date

Hope

Does <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> constantly move anyone else’s ovulation date? I had a dip in my BBT today which makes me think today is ovulation day, and for the last few days that’s what <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> has said, but now suddenly the app shows that it’s in two days. Help!