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Gestational age is the age of pregnancy when counted from LMP or two weeks before conception.

Fetal age is the age of pregnancy when counted from Conception.

Your pregnancy may also be dated by ultrasound measurement if an LMP formula was not appropriate for your pregnancy for any reason.

LMP formulas are not suitable in a number of situations including the following: LMP is not known or is not certain, birth control pills were taken in the two months before LMP, the menstrual cycle is irregular, you are carrying multiples (twins or more).

LMP = December 2, 2015Current Date = February 4, 2016 Calculation: 1st Wed = December 9, 2015 = 1 Week 2nd Wed = December 16, 2015 = 2 Weeks 9th Wed = February 3, 2016 = 9 Weeks You are 9 Weeks and 1 Day pregnant Another method to calculate how many weeks pregnant you are, is to count the days from the first day of your Last Menstrual Period (LMP) until you reach todays date.

The first 2 weeks, when you are not actually pregnant is included for convenience only.

LMP is used as the start point in measuring pregnancy because the date of conception is usually not known.

Historically, the first day of the last menstrual period (LMP) became the date from which pregnancy is counted even though conception occurs about two weeks later.

The LMP formula is good for working out an initial age of pregnancy but ultrasound is more accurate.

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