Given the data you reported (birth control until 11 may, no menstrual period since May, and negative birth control test), it is possible that you might be experiencing amenorrhea. Amenorrhea is a condition in which there is a complete absence of a menstrual period.
There are many possible causes for amenorrhea including: anovulation, pregnancy, premature menopause, or menopause. Changes in the normal sex hormone production pattern due to polycystic ovary syndrome (PCOS), or hypothalamic-pituitary dysfunction might be responsible for amenorrhea. Other hormone production irregularities like hyperprolactinemia (elevated prolactin levels in the blood), or thyroid gland dysfunction might cause amenorrhea, too.
You might want to visit a gynecologist for a physical examination, hormonal laboratory tests, and an ultrasound scan in order to determine the condition of the ovaries and to confirm or to rule out pregnancy. You might be referred to an endocrinologist if dysfunction of the pituitary or thyroid gland is detected.
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