Hi! My Name Is Tasha. My Boyfriend And I Are

Hi! my name is Tasha. My boyfriend and i are TTC baby #1. It is our first time. This month i had my period which came the 12th of January and ended the 16th of January. I have a regular period and my cycle is 28 days. I use two period tracking apps. They both tell me when my fertile window begins and when i ovulate. One of the other apps actually tells me the percentage chance for pregnancy in my fertile window. Monday 23rd i have a 15% chance of pregnancy, Tuesday 24th i have a 27% chance of pregnancy, Wednesday 25th the day before ovulation i have a 33% chance of pregnancy and the day of ovulation Thursday 26th i have a 22% chance of pregnancy. Do you think if i have sex during these 4days of my fertile window along with it's percentage prediction for pregnancy it will work? My boyfriend has no low sperm count and he is fertile. So am i. Thank you best regards -Tasha