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Well, we don't want any "accidents" in recovery, do we?. In our program, we do not perform the embryo transfer with the aid of ultrasound, so there is no need for a full bladder. A full bladder increases the stress level too, particularly if you're transfer #27 that morning. Look out! She's gonna blow! To use U/S or not is a personal preference of the physician. There have been numerous publications on both sides of this fence. One method is not clearly superior to another.
If they transfer the embryos at the blastocyst stage, it is most likely that the embryos will attach to the endometrium that day/night. Once attached and initiating implantation, the embryos will not be dislodged by contractions (another good reason for blastocyst transfer). If the embryos are transferred on Day 3, they may slosh around a bit during contractions, as they cannot attach to the endometrium until the reach the blastocyst stage on Day 5-6 of development. Contractions may evict them from the "sweet spot" near the top of the uterine cavity to the less hospitable region of the lower endometrium or, alternatively, squeeze them into the tube. Progesterone has a "calming" effect on uterine contractions. You may need additional progesterone during the period leading up to the transfer to ensure you have enough on board to prevent contrations immediately after transfer.
Usually, chemical pregnancies are caused by genetically abnormal embryos and/or immune issues (elevated or overzealous NK cells). It is unlikely these contractions would cause a chemical pregnancy UNLESS the embryos were relocated to a lower region of the uterine cavity that is not designed to allow implantation This nature's way of preventing a pregnancy doomed to miscarriage because of its location in the uterus. The growing baby would put too much pressure on the cervix, dilate it prematurely and result in disaster.
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