Question on fertile window

Amy • Married and we have our rainbow baby strong and now a toddler and we have #2 due in august hope she is and wishing everyone a healthy pregnancy and delivery 💍💏🌈💗🤰
Hey I'm new to the app & I was wondering if some of the ladies could help me understand the fertile window period. Like I've heard sperm lifespan is usually up to 3 days & certain days are higher percentages but don't tell me when I'm exactly ovulating like some apps do. Are the highest days meaning that if you have sex that day it may be likely to get pregnant or if you have sex in those 7 days in general you could have easily have a chance to become pregnant. The more information about the fertile 7 day window would be most wonderful thank you & i appreciate all the help in understanding the app.