Regular periods indicates a positive ovulation.
If periods delays by 4-8 days nothg to worry , if more than that u may be suffering from , ovarian problem etc
Next Steps
U can go for tests like CBP,
TSH , USG pelvis
Health Tips
Life style changes helps u lot in this scenario. Nutritional diet , exercise , stress free lifestyle makes ur hormones balanced . Depending on your physical findings and investigation report , u can use medicines