Doctor insights on: What does it feel like when the embryo implants

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How many cells does an embryo have to be before it implants? When does cell division start?

How many cells does an embryo have to be before it implants? When does cell division start?

Cell division starts: Right after fertilization. The blastocyst is the preimplantation embryo. It has a varying cell number (30 to 200). ...Read more

Dr. Debra Rosenblatt
5 Doctors shared insights

Implant (Definition)

An implant is a medical device manufactured to replace a missing biological structure, support a damaged biological structure, or enhance an existing biological structure. Medical implants are man-made devices, in contrast to a transplant, which is ...Read more


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Why does an embryo not implant after transfer?

Why does an embryo not implant after transfer?

Great question: In most cases we do not know. Some reasons: 1) poor quality, old, or abnormal embryo, some estimate only 1 embryo in 4 will be successful, 2) inappropriately developed endometrium, which can happen if too much/too little Progesterone before transfer, 3) bad placement or rough/difficult transfer. Many things we still do not know! ...Read more

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Do frozen embryo transfers implant quicker than fresh?

Do frozen embryo transfers implant quicker than fresh?

Not really: Human embryos, whether natural or from ivf. Forzen or fresh, always implant between 6-7 days after fertilization. ...Read more

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Can a embryo take up to three weeks to implant? What's the longest it's been known to take?

Can a embryo take up to three weeks to implant? What's the longest it's been known to take?

Please clarify?: A human embryo can implant 6-7 days after fertilization, and will produce detectable hCG (if the pregnancy proceeds normally) by about 10-11 days. This is 2-3 days before the expected period. An embryo cannot implant as late as 3 weeks after fertilization. I hope this helps, please submit again and clarify if you are asking a different question. Good wishes. ...Read more

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How many cells does an embryo have before it implants? How long is the cell division process before implantation?

Embryo Cell number: At fertilization, one sperm enters the egg cell (2 cells) and in short while the egg nucleus and sperm nucleus merge to form one cell, called a zygote. The sperm and the egg each had 23 chromosomes, . ...Read more

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Does embryo implant two days after fertilization?

Does embryo implant two days after fertilization?

No: The embryo usually implants about a week or so after fertilization, when it reaches the blastocyst stage. ...Read more

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How many cells does an embryo/blastocyst have before it implants? And how many days after its fertilized does it implant?

How many cells does an embryo/blastocyst have before it implants? And how many days after its fertilized does it implant?

About a week: Implantation generally occurs about a week after fertilization. By this time, the embryo is called a blastocyst, which is a ball of many cells (up to hundreds) divided into regions called the trophoblast (the part that will become the placenta) and inner cell mass (part that will become the baby). ...Read more

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Why do embryos implant later with ivf?

Why do embryos implant later with ivf?

They don't: Human embryos always implant between 6-7 days of age, whether with natural or ivf. Before this they are too "young" to implant. ...Read more

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How long does it take for an embryo to implant after sex and fertilization?

How long does it take for an embryo to implant after sex and fertilization?

7 to 10 days.: It takes about 7 to 10 days for the fertilized egg to travel down the tube and implant in the uterus. You might see implantation bleeding as early as 4 to 7 days before a missed period. ...Read more

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Why would a embryo transfer of a excellent quality blastocyst fail to implant? What should I ask at follow up?

Why would a embryo transfer of a excellent quality blastocyst fail to implant? What should I ask at follow up?

Possible reasons. ..: Could be - 1) genetic or metabolic abnormalities in the embryo, 2) problems with the lining of your uterus including polyps, or 3) difficulties with the embryo transfer itself. For 2) you should have had a saline sonogram (shg) or other procedure to check your cavity and ultrasounds to check your lining. Single embryo transfer (set) has a lower pregnancy rate than 2 embryos, even if you're young. ...Read more

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Does a polypectomy 3 weeks prior of embryo transfer cause the embryo not to implant? Maybe because it didn't heal?

Where was UR polyp?: Are you talking about polyps of the nose, stomach, colon, uterus, or some other structure? Happy to help if you can clarify the circumstance of your question--. ...Read more

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What does a frozen embryo transfer entail? How much time off will I need to take from work? Are they less likely to implant?

What does a frozen embryo transfer entail? How much time off will I need to take from work? Are they less likely to implant?

Depends on freeze &: The doctor's/center's protocols. Vitrified embryos have a success rate equal to fresh in most of todays' programs; embryos frozen in the older 'slow freeze' method are roughly 1/2 as likely to result in pregnancy vs. Fresh. Time-off-work is less than with a fresh IVF cycle but can vary a lot form center to center. ...Read more

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How many days after fertilization does the fertilized egg become a blastocyst? Then embryo? What implants-the blastocyst or embryo?

The process: As the fertilized egg divides, it is first known as a morula. Approximately 5 days from first fertilization it forms into a hollow ball known as a blastocyst. This blastocyst implants and begins to sort itself out into different layers--the inner group becomes the embryo and the outer layer will work to nourish and protect. At approximately 6-7 weeks from time of fertilization, an embryo begins. ...Read more

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Can embryo implant in 3mm uterine lining?

Implantation.: Yes, but if is really that thin, you may be at risk for a miscarriage. You need to discus this with your OB. ...Read more

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Does a embryo implant in an 20 mm uterine lining?

Yes: In general we want the lining to be nice and thick at least 8 mm. 20 is definitely thick. I think the most important thing is that there is no uterine polyp inside there causing it to be thick. ...Read more

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Is conception considered when the embryo implants in the uterus?

Conception: No. Conception is when a baby is conceived. When the sperm meets the egg. ...Read more

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What are the factors positively influencing a successful implant of the embryo in an icsi IVF procedure?

Several: Age of female most important, ovarian reserve tests (fsh, amh, afc), stimulation factors, excess embryos for freezing, number and quality of embryos, day of transfer, chromosome screening, technique of transfer, and ejaculated vs testicular sperm. Also, icsi overused, so avoid it if possible - about 2-4% higher delivery without icsi. Icsi is just the technique to inseminate the egg. Best wishes. ...Read more

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I am 44, using donor eggs (donor aged 31) and had two unsuccessful day 5 blastocyst implants. I have three embryos left. What are my chances?

Oocyte donation: If the embryos were good quality when they were frozen, you should still have a very good chance of getting pregnant. Still, even in young donors, not all the embryos are genetically normal even though they appear fine. The only way to tell if they are normal before transferring them would be through pre-implantation genetic screening. You could consider this next if you didn't conceive again. ...Read more

Embryo (Definition)

An embryo is a developing human being from between 1- ...Read more