Should I just give up??

Jasmin
Ok so my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says I'm 12 dpo and will have Af in 3 days and a diffrent appt shows 9dpo and will have af in 5 days. I took a hpt 3 days ago & yesterday morning and was bfn (was a first response lines test) or should I just stop hopeing and realize I'm not going to be pregnant this month 😢 or do I still have chance??