TTC.. today is 15 dpo, supposed to get my period

Boyfriend and I are trying to have baby #4 but I’m losing hope. 😭 I use this app to track my periods and ovulation dates and we’ve done the business the week I was ovulating for the whole week straight. I’m supposed to get my period today and decided to take a test this morning at 3 AM when I had to pee, and came up negative 😔 I’ve been testing and testing since 9 dpo and all were negatives... I think I have a POAS addiction lol Has anyone ever been in the same boat and actually became pregnant? This waiting game is driving me nuts! 😞