Dating, Fetal Age, etc. to clear up ANY confusion

I am almost 41 weeks by the last known period method of dating that most people and doctors use.

"Ovulation usually occurs about 2 weeks after a woman's menstrual period starts, and fertilization usually occurs shortly after ovulation. Consequently, the embryo is about 2 weeks younger than the number of weeks traditionally assigned to the pregnancy. In other words, a woman who is 4 weeks pregnant is carrying a 2-week-old embryo. If a woman's periods are irregular, the actual difference may be more or less than 2 weeks.

Pregnancy lasts an average of 266 days (38 weeks) from the date of fertilization (conception) or 280 days (40 weeks) from the first day of the last menstrual period if the woman has regular 28-day periods."

I simply go by known date of conception/fetal age as a personal preference which means I consider myself almost 39 weeks instead.

"The other way of measuring the dates of the pregnancy is to measure the fetal age.  The fetal age of the pregnancy is measured from the time of conception or the estimated time of conception (ETC).  When measuring the pregnancy in this fashion, it will be 38 weeks long or two weeks shorter than the gestational age dates.  The fetal age, of course, is the actual age of the pregnancy."

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"Historically, the obstetrician has focused on the first day of the last menstrual period for two reasons.  First of all, the menstrual flow itself is a fairly dramatic symptom which the woman can be expected to remember.  In addition, it is easy to teach her to record the first day of the last menstrual period so that when that information is elicited by the physician, at a later time, it is available.

However, in the midst of all of this, the obstetrician and many women have missed the point that the cervical mucus discharge is very much a flow in the same fashion as the menstrual flow.  In some countries, they refer to menstruation as the red flow and the mucus discharge as the white flow.  Unfortunately, modern obstetrics has paid little attention to the white flow."