Fertile window?

BeautyMommy • Have two little girls alive in this world. One I adopted out. Very hard decision. Plan on having more soon but for now, Trying hard to better myself and my life so I can give my children the world.
My cycles are around 30-35 days long. I thought the fertile window started around 3 days after last day of period. Suddenly my glow chart is showing almost 8 days from last AF day to first fertile day. Does this sound right to anybody?