Need not be a PCOD
For delayed periods generally these are simple common causes
Tension
Night wake up/ day sleep
Skipping foods
Excess Intake of coffee/ black tea/ soft drinks
Another cause is Body nature
Next Steps
Need to explore the root cause in routine.
If no other health issues like indigestion, weight gain, constipation, head ache, fatigue etc then no need to worry.
Health Tips
Judicious use of sesame oil with hot food like 2 tsp at each time maximum of 6tsp in a day will help to correct uterus health.
Daily Application of warm sesame oil to whole body just before bath by own hands without pressure will correct the periods.