Ovulation apps only give estimates, not exact ovulation days. Since you had intercourse around the fertile window, there is a small chance of pregnancy, even if exposure was brief. Taking Deviry can delay periods, so the delay and discharge may be due to hormones.
Your early UPT can be falsely negative. Repeat a urine
pregnancy test after 5–7 days or do a blood β-hCG for confirmation. If periods don’t come, consult a gynecologist