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  2. Why Is My Period Late? 6 Possible Reasons (Besides the ... - AOL

    www.aol.com/lifestyle/why-period-6-possible...

    Below, six reasons—other than pregnancy—that your period might be late, according to Dr. Mary Jacobson, Chief Medical Advisor at Alpha Medical, a healthcare company formed with the goal of ...

  3. Amenorrhea - Wikipedia

    en.wikipedia.org/wiki/Amenorrhea

    Amenorrhea or amenorrhoea is the absence of a menstrual period in a female who has reached reproductive age. [1] Physiological states of amenorrhoea are most commonly seen during pregnancy and lactation (breastfeeding). [1] Amenorrhoea is a symptom with many potential causes. [2]

  4. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    [13] [14] The result is approximately 280 days (40 weeks) from the start of the last menstrual period. Another method is by adding 9 months and 7 days to the first day of the last menstrual period. Naegele's rule is named after Franz Karl Naegele, the German obstetrician who devised the rule. Naegele was born July 12, 1778, in Düsseldorf, Germany.

  5. Menstrual cycle - Wikipedia

    en.wikipedia.org/wiki/Menstrual_cycle

    Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...

  6. Why do doctors always ask about your last menstrual period ...

    www.aol.com/lifestyle/why-doctors-always-ask...

    Knowing the first day of a woman’s last menstrual period is useful in other ways. Dr. Arlene Go, an ob-gyn and specialist fellow studying endometriosis at Hera Biotech, tells Yahoo Life that it ...

  7. Here's What Really Happens During Your Menstrual Cycle - AOL

    www.aol.com/heres-really-happens-during...

    Grab a calendar or download a period-tracking app and denote the first day of your last menstrual cycle as well as any symptoms you experience and how heavy your bleeding is. “I think the data ...

  8. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    Other algorithms take into account other variables, such as whether this is the first or subsequent child, the mother's race, age, length of menstrual cycle, and menstrual regularity. In order to have a standard reference point, the normal pregnancy duration is assumed by medical professionals to be 280 days (or 40 weeks) of gestational age.

  9. Menstrual disorder - Wikipedia

    en.wikipedia.org/wiki/Menstrual_disorder

    Normal menstrual cycle length is 22–45 days. [4]Amenorrhea is the absence of a menstrual period in a woman of reproductive age. Physiologic states of amenorrhoea are seen during pregnancy and lactation (breastfeeding).