Sex 1 or 2 days before fertile week effectiveness ?

I've heard that its a good idea to baby dance a day or two before your fertile week because the sperm can survive up to 5 days. Soo should we try on the 25, 26, and the rest of my fertile week? Or is that already accounted for during the fertile week? i would really just love to know how to know when the egg is released to know what days would be are best chances for actually conceiving? And yes the calendar in the picture is from the app Ovia I find it more accurate than the days Glow predicts for me.