Question about ovulation

Alyssa

Hi I have a question about ovulation and <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> , when <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> says that it is 3 days before a fertile window is the egg already released or is the egg released on the first day of your fertile window ( I am aware <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> is not that accurate)