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Calculating Conception

Calculating Conception

Gestational age, or the age of the baby, is calculated from the first day of the mother’s last menstrual period. Since the exact date of conception is almost never known, the first day of the last menstrual period is used to measure how old the baby is.

Use our Pregnancy Calculator to calculate these dates for you.

Calculating Gestational Age

Last Menstrual Period

If the mother has a regular period and knows the first day of her last menstrual period, gestational age can be calculated from this date. Gestational age is calculated from the first day of the mother’s last menstrual period and not from the date of conception.

Ultrasound

 The baby can be measured as early as 5 or 6 weeks after the mother’s last menstrual period. Measuring the baby using ultrasound is most accurate in early pregnancy. It becomes less accurate later in pregnancy. The best time to estimate gestational age using ultrasound is between the 8th and 18th weeks of pregnancy. The most accurate way to determine gestational age is using the first day of the woman’s last menstrual period and confirming this gestational age with the measurement from an ultrasound exam.

Calculating Conception Date

In a Typical Pregnancy

For a woman with a regular period, conception typically occurs about 11-21 days after the first day of the last period. Most women do not know the exact date of conception because it can be challenging to know exactly when ovulation occurs. Thus, their conception date is merely an estimate based on the first day of their last period.

Special Cases

Women who undergo special procedures, such as artificial insemination or in vitro fertilization, typically know the exact date of conception.

Calculating Due Date:

Estimated Due Date

Based on the last menstrual period, the estimated due date is 40 weeks from the first day of the period. This is just an estimate since only about 5% of babies are born on their estimated due date.

Difficulties In Determining Gestational Age

Last Menstrual Period

For women who have irregular menstrual periods or women who cannot remember the first day of their last menstrual period, it can be difficult to determine gestational age using this method. In these cases, an ultrasound exam is often required to determine gestational age.

Baby’s Growth

In some cases, it is difficult to determine the gestational age because the baby is unusually large or small. Also, in some cases the size of the uterus in early pregnancy or the height of the uterus in later pregnancy does not match the first day of the last menstrual period. In these cases as well, it is difficult to obtain an accurate gestational age.

Health – Medicine 0 comments on The Fetal Life-Support System: Placenta, Umbilical Cord, & Amniotic Sac

The Fetal Life-Support System: Placenta, Umbilical Cord, & Amniotic Sac

The Fetal Life-Support System: Placenta, Umbilical Cord, & Amniotic Sac

 

Your baby will develop inside your uterus with the help of a fetal life-support system composed of the placenta, the umbilical cord, and the amniotic sac (which is filled with amniotic fluid).

What Is The Placenta And What Does It Do?

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Human Chorionic Gonadotropin (HCG): The Pregnancy Hormone

Human Chorionic Gonadotropin (HCG): The Pregnancy Hormone

The hormone human chorionic gonadotropin (better known as hCG) is produced during pregnancy.

It is made by cells formed in the placenta, which nourishes the egg after it has been fertilized and becomes attached to the uterine wall. Continue Reading “Human Chorionic Gonadotropin (HCG): The Pregnancy Hormone”

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Fetal Development

Fetal Development

 

Calculating the day your baby begins to develop and keeping track of your pregnancy dates can be a challenge. The development of pregnancy is counted from the first day of your last normal period, even though the development of the fetus does not begin until conception. Pregnancy is calculated from this day because each time a woman has a period, her body is preparing for pregnancy. Continue Reading “Fetal Development”

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First Fetal Movement: Quickening

First Fetal Movement: Quickening

Some moms can feel their babies move as early as 13-16 weeks from the start of their last period. These first fetal movements are called quickening and are often described as flutters. It may be difficult to determine whether this feeling is gas or your baby’s movements, but soon you will begin to notice a pattern. First-time moms may not feel these movements as early as second-time moms. Continue Reading “First Fetal Movement: Quickening”

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Fetal Development: Third Trimester

Fetal Development: Third Trimester

 

Weeks 27 Thru 32 – Gestational Age (Fetal Age – Weeks 25 Thru 30):

The fetus really fills out over these next few weeks, storing fat on the body, reaching about 15-17 inches long and weighing about 4-4 ½ lbs by the 32nd week. The lungs are not fully mature yet, but some rhythmic breathing movements are occurring. The bones are fully developed, but are still soft and pliable. The fetus is storing its own calcium, iron and phosphorus. The eyelids open after being closed, since the end of the first trimester. Continue Reading “Fetal Development: Third Trimester”

Biological, Health – Medicine 0 comments on Fetal Development: Second Trimester

Fetal Development: Second Trimester

Fetal Development: Second Trimester

Weeks 14 Thru 16 – Gestational Age (Fetal Age – Weeks 12 Thru 14):

The fetus’s skin is transparent and a fine hair called lanugo begins to form on the head. The fetus begins sucking and swallows bits of amniotic fluid. Fingerprints which individualize each human being have now developed on the tiny fingers of the fetus. Meconium is made in the intestinal tract and will build up to be the baby’s first bowel movement. Flutters may be felt in the mom’s growing abdomen, as the fetus begins to move around more. Sweat glands have developed, and the liver and pancreas produce fluid secretions. The fetus has reached 6 inches in length and weighs about 4 ounces.

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Biological, Health – Medicine 0 comments on Fetal Development: First Trimester

Fetal Development: First Trimester

Fetal Development: First Trimester

The First Trimester Of Pregnancy

Week 1 & 2 – Gestational Age

Your menstrual period has just ended, and your body is getting ready for ovulation. For most women, ovulation takes place about 11 – 21 days from the first day of the last period. During intercourse, several hundred million sperm are released in the vagina. Sperm will travel through the cervix and into the fallopian tube.

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