Hello dear
Understand your concern.
I think it is normal, sometime period will be late. Wait for few more days.
Also note the other causes of late period
Pregnancy, High level of stress, Change in life style, Late ovulation, 
Excessive weight loss, Birth control pills, thyroid medication, Excessive tea and caffeine use, Thyroid abnormality, 
Hormonal imbalance, 
Dysfunctional uterine bleeding.
Advice for you:
Wait and watch
Do regular walking and exercise
Eat healthy diet
Drink more fluids
Eat fruits like papaya, orange and pomegranate.
If period will note come , consult the gynecologist and undergo following test:
Pregnancy test
Pelvic examination, complete hormone profile(E2, P, FSH, LH, Thyroid, 
Prolactin)
USG
PAP smear
Hope this may help you.
Best regards
Dr. Sagar