Pregnancy doesn鈥檛 start the day you have sex 鈥?it can take up to six days after sex for the sperm and egg to join and form a fertilized egg. Then,it can takethree to four daysfor the fertilized egg to completely implant itself in the lining of the uterus. How long does it take for sperm to reach the egg and implant?
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How long does it take for fertilized egg to implant?
Implantation can be completed as early as eight days or as late as 18 days after fertilization, but usually takes about 14 days. Between one-third and one-half of all fertilized eggs never fully implant. Furthermore, what happens to a fertilized egg that does not implant?
What happens if a fertilized egg does not implant?
If the egg is not fertilized or does not implant, the woman’s body sheds the egg and the endometrium. This shedding causes the bleeding in a woman’s menstrual period. When a fertilized egg does implant, a hormone called human chorionic gonadotropin (hCG) begins to be produced in the uterus.
What is embryo implantation?
Embryo implantation is the stage in pregnancy in which the fertilized egg, also called a blastocyst, attaches itself to the uterine wall lining. This implantation marks the commencement of pregnancy.
Can 4-day-old embryos be implantated into human beings?
In the study, the researchers used four-day-old human embryos that had been created by IVF. Some of the embryos were later implanted in women, and led to successful pregnancies, while others were not suitable for implantation because of developmental impairments.