Feeling hopeless 😩

I followed the calendar exactly, took the digital OPK, got my egg yolk discharge. Tests results and discharged matched exactly like <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation calendar</a> states so I feel like a had a high chance. I’m 13dpo, so I just took a digital pregnancy test, and the result still shows negative!!!! What I’m I doing wrong?!?! Ughh feeling irritated and annoyed.