Soo happy today😜

This week are my fertile days sooo you know what that mean lol but on a serious note I'm really hoping and praying that I can conceive.... Because I've had tried on my most fertile days and failed to get pregnant sooo I just hope I can... But question if I had sex on my fertile days why I didn't get pregnant???? Can someone please answer that for me I'm confused 😕?? Please thank you