Missed period but negative pregnancy test? There are several reasons this may happen.
1. Low Level Hormone
Sometimes the levels of the pregnancy hormone human chorionic gonadotropin (hCG) early in pregnancy aren’t yet high enough for a home pregnancy test to detect. A woman’s cycle can vary widely, so if you conceived later in your cycle, your hormone levels may not be high enough at the time of your missed period. If you think you may be pregnant after a missed period but got a negative result on your pregnancy test, wait a few days. Then retest. If you continue to miss your period, be sure to talk to your doctor to rule out any complications.
2. Major weight loss or Excessive Exercise
Sudden lifestyle changes, such as intense exercise or working the overnight shift on your job, can also cause your period to be irregular. Serious conditions like anorexia and bulimia can cause a missed period, but so can training for a marathon or some other major event that requires you to exercise more than usual.
Stress can delay your period. You already know stress can have a number of unpleasant side effects, like headaches, weight gain and acne — and it can also affect your menstrual cycle. Your cycle can fluctuate if you drink too much caffeine or don’t eat enough food.
4. Thyroid irregularity
The thyroid gland, located in your neck, regulates your metabolism. It also interacts with many other systems in your body to keep things running smoothly. Whether it’s hypo- or hyperthyroidism, it can cause abnormal menstrual changes. A blood test can help your doctor determine if you have a thyroid disorder.
5. PCOS (POLYCYSTIC OVARY SYMPTOM)
Polycystic ovarian syndrome (PCOS) is a condition where the female sex hormones are out of balance. It can cause cysts on the ovaries and prevent ovulation from occurring regularly. In addition to missed or irregular periods, PCOS can also cause excess hair growth, acne, weight gain and possibly infertility. Your doctor can do a blood test to check your hormone levels if you think PCOS may be the reason for your menstruation problems. If PCOS is the cause, your doctor may recommend birth control to regulate your periods.
6. Chronic diseases like celiac
Celiac disease is a serious autoimmune disorder that can occur in genetically predisposed people where the ingestion of gluten leads to damage in the small intestine. It is estimated to affect 1 in 100 people worldwide. Two and one-half million Americans are undiagnosed and are at risk for long-term health complications. Any chronic disease that’s left untreated or undiagnosed is a stressor to your general system and can result in missed periods.”
7. Birth control
Birth control may cause irregularities in your cycle. Other types of medications may lead to a missed period, as well. For example, blood pressure drugs or allergy medications can throw off your cycle.
8. Breast Feeding
Breastfeeding can cause some irregularities in your cycle. Even after your baby arrives and your period returns, it may take some time before your cycle goes back to normal.
Breastfeeding is also unpredictable month to month. As babies grow, their feedings may change. For example, if your baby goes through a growth spurt and suddenly increases the frequency of night feedings, it may interfere with your cycle
9. Premature menopause
Menopause for women typically begins around age 50. When women under 40 have hormones misfiring in a significant way, they can go through premature menopause, also known as premature ovarian failure. Along with a missed period, signs of it include hot flashes, night sweats, and vaginal dryness. It’s different for everyone. If you have missed your period for over 90 days and are not pregnant, talk to your doctor about getting tested for any underlying medical conditions.