If you are trying to conceive, then any delay in periods should be first considered to rule out pregnancy by performing Urine
Pregnancy Test.
If it's negative then either it's due to hormonal variation or cycle pattern change.
Next Steps
Urine
pregnancy test.
Hormonal evaluation.
Sonography.
Health Tips
Monitor your menstrual cycle pattern.
Drink plenty of water and fluids.
Eat healthy full mixed diet.