Knowledge | How Pregnancy Begins: From Ovulation to Implantation
Pregnancy is often exciting, but most women cannot identify the exact day of conception. Doctors date pregnancy from the first day of the last menstrual period, about two weeks before conception actually occurs.
Here are the basics of conception:
Ovulation: Release of the Egg
Each month, a group of eggs begins growing in small fluid-filled sacs called follicles. Eventually, one egg is released in a process called ovulation, usually about two weeks before the next period begins.
Rising Hormone Levels
After releasing the egg, the follicle becomes the corpus luteum. It produces a hormone that thickens the uterine lining in preparation for implantation.
The Egg Enters the Fallopian Tube
The released egg enters the fallopian tube and remains there for about 24 hours, waiting for sperm. This generally occurs about two weeks before menstruation.
If the Egg Is Not Fertilized
An unfertilized egg travels into the uterus and breaks down. Hormone levels return to normal, the uterine lining sheds, and menstruation begins.
Fertilization: Sperm Meets Egg
If a sperm reaches the fallopian tube and penetrates the egg, fertilization occurs. The egg then changes to prevent other sperm from entering.
The baby's genes and sex are determined at fertilization. A Y-bearing sperm results in a boy, while an X-bearing sperm results in a girl.
Implantation: Movement Toward the Uterus
The fertilized egg remains in the fallopian tube for about 3 to 4 days. Within 24 hours, it begins dividing rapidly while moving slowly toward the uterus. It then attaches to the uterine lining, a process called implantation.
Implantation may cause light spotting for 1 to 2 days. The uterine lining thickens, and a mucus plug seals the cervix until birth.
Within about 3 weeks, cells begin forming clusters and the baby's first nerve cells have developed.
The Pregnancy Hormone hCG
Human chorionic gonadotropin (hCG) appears in the blood after implantation and is the hormone detected by pregnancy tests. Some home tests can detect hCG about 7 days after ovulation.
Pregnancy is a complex process in which every stage matters. Understanding conception can help women know their bodies and identify the timing of pregnancy more clearly.
Knowledge | How Pregnancy Begins: From Ovulation to Implantation
Knowledge | How Pregnancy Begins: From Ovulation to Implantation
Pregnancy is often exciting, but most women cannot identify the exact day of conception. Doctors date pregnancy from the first day of the last menstrual period, about two weeks before conception actually occurs.
Here are the basics of conception:
Ovulation: Release of the Egg
Each month, a group of eggs begins growing in small fluid-filled sacs called follicles. Eventually, one egg is released in a process called ovulation, usually about two weeks before the next period begins.
Rising Hormone Levels
After releasing the egg, the follicle becomes the corpus luteum. It produces a hormone that thickens the uterine lining in preparation for implantation.
The Egg Enters the Fallopian Tube
The released egg enters the fallopian tube and remains there for about 24 hours, waiting for sperm. This generally occurs about two weeks before menstruation.
If the Egg Is Not Fertilized
An unfertilized egg travels into the uterus and breaks down. Hormone levels return to normal, the uterine lining sheds, and menstruation begins.
Fertilization: Sperm Meets Egg
If a sperm reaches the fallopian tube and penetrates the egg, fertilization occurs. The egg then changes to prevent other sperm from entering.
The baby's genes and sex are determined at fertilization. A Y-bearing sperm results in a boy, while an X-bearing sperm results in a girl.
Implantation: Movement Toward the Uterus
The fertilized egg remains in the fallopian tube for about 3 to 4 days. Within 24 hours, it begins dividing rapidly while moving slowly toward the uterus. It then attaches to the uterine lining, a process called implantation.
Implantation may cause light spotting for 1 to 2 days. The uterine lining thickens, and a mucus plug seals the cervix until birth.
Within about 3 weeks, cells begin forming clusters and the baby's first nerve cells have developed.
The Pregnancy Hormone hCG
Human chorionic gonadotropin (hCG) appears in the blood after implantation and is the hormone detected by pregnancy tests. Some home tests can detect hCG about 7 days after ovulation.
Pregnancy is a complex process in which every stage matters. Understanding conception can help women know their bodies and identify the timing of pregnancy more clearly.
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