My period isn't coming?!?

Question

So a few weeks ago I was getting really nauseous and every time I ate I was felt like throwing up so I decided not to eat for two weeks (stupid decision) and I lost 10 pounds (127lbs to 117lbs) and now my period is really late. Plus I was really stressed out  (because of a bad relationship) Can this be a reason why my period isn't coming?    Also my period is never late. I did have unprotected sex a week before my period, I took a test and it was negative so idk I need help!!!!

Answer

Yes it can be, stress is a big one. 
If you don't get it soon, go to the Dr they can give you something to start your period. 
If you are not pregnant, other causes of missed or irregular periods include:
Excessive weight loss or gain. Although low body weight is a common cause of missed or irregular periods, obesity also can cause menstrual problems.
Eating disorders, such as anorexia or bulimia. For more information, see the topic Anorexia Nervosa or Bulimia Nervosa.
Increased exercise. Missed periods are common in endurance athletes.
Emotional stress.
Illness.
Travel.
Medicines such as birth control methods, which may cause lighter, less frequent, more frequent, or skipped periods or no periods at all.
Hormone problems. This may cause a change in the levels of the hormones that the body needs to support menstruation.
Illegal drug use.
Problems with the pelvic organs such as imperforate hymen, polycystic ovary syndrome, or Asherman's syndrome.
Breastfeeding. Many women do not resume regular periods until they have completed breastfeeding.

My period isn't coming?!?

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