Why haven't I had my period for a year?

You can confirm either with a home pregnancy test or a urine test to confirm pregnancy. 

Recovering from dengue fever, one is likely to have irregular periods. However, there should be consultation with a gynecologist to rule out other underlying conditions.

Check for any changes in your baby's fetal movements, becuase it can decrease its oxygen supply. Contact your gynecologist immediately.

The normal cycle sometimes is longer or shorter than usual. But if your cycle goes on longer than 10 days or if you have severe bleeding, you should see a doctor. You should see your gynecologist for a proper diagnosis and treatment of your condition.
 

Pregnancy is some­times hard to detect e­arly on. Signs like fatigue, queasine­ss, and sensitive breasts can be­ mild or mistaken for something else­. Stress or health problems can cause­ similar symptoms too. The most reliable­ way to know is by taking a pregnancy test eithe­r at home or a clinic. 

Not having periods when they are due, throwing up, being weary, sensitivity in the chest area, and frequent urination may indicate that someone is pregnant. Feeling like one is pregnant might also come from anxiety, hormonal imbalances, or other medical conditions. Make sure to use a pregnancy kit. 

It seems that some troubling symptoms are making you uneasy. Could the late arrival of a period, along with back pain and itching, be associated with each other? Stress or hormonal changes can cause late menstruation to occur. It may be an injury caused by a strained muscle if back pain occurs. A rash might be a result of dry skin or an allergic reaction. Sufficient water intake, a well-balanced diet, and a good sleep pattern might be some of the things that can help. In case the symptoms persist, it is vital to consult a doctor.