Fertility

Amy • Kinesiology/Physical Therapy major... future Doctor
So my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> notification alerted me to my fertility date saying my fertile window was opening in 3 days...now 2 and there's a 7% chance of pregnancy. And am so confused. Is that only if I have sex