Symptoms often start with irregularities in your menstrual cycle. If you have PCOS, eggs remain in the ovaries, where they can't be fertilized. Polycystic ovary syndrome (PCOS): This condition affects the hormones that release mature eggs. This condition can usually be treated with medication. Your body usually makes prolactin when you're breastfeeding, which is why menstruation generally stops during that time. Too much prolactin: You might miss a period (or more than one) if you're producing an abnormally high level of the hormone prolactin.Your doctor can do a blood test to determine how well your thyroid is working, and thyroid conditions can usually be corrected with medication. An overactive thyroid ( hyperthyroidism) might cause nervousness, irritability, problems sleeping, a fast heartbeat, and weight loss. Symptoms of an underactive thyroid ( hypothyroidism) include fatigue, weight gain, and a slow pulse. Thyroid disorder: An underactive or overactive thyroid can lead to missed periods.Women can stop having regular periods for many reasons, including diabetes, eating disorders, excessive exercise, stress, obesity, very low body fat, or some medications. If you miss more than three periods in a row and pregnancy tests are all negative, see your doctor for a thorough evaluation. Your ovaries normally release one egg every month or so, and if it's not fertilized, menstruation starts about 14 to 16 days after ovulation. This is known as the "hook effect." This can happen if you're further along in your pregnancy or if you're carrying twins or triplets. Occasionally, extremely high levels of hCG prevent home pregnancy tests from being able to properly read the result, and the read ends up being negative. Can twins cause a false negative pregnancy test? It's called a "false negative" pregnancy test result. In fact, some researchers estimate this happens with up to 5 percent of home pregnancy tests. Yes, it's possible to be pregnant and have a negative pregnancy test result. Is it possible to have a negative pregnancy test but still be pregnant? These tests are more accurate than urine pregnancy tests. If you suspect your pregnancy test result is a false negative, ask your doctor for a blood pregnancy test. Check the outside of the package for the expiration date and storage instructions.
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