After this, the whole procedure becomes just like that of in vitro fertilization (IVF). The sperm of your partner’s or a donor’s sperm will be merged with your donor’s eggs in a Petri dish in a laboratory. After two to five days, every fertilized egg will become a mass of cells called an embryo. Your doctor then will place two to four embryos into your uterus via your cervix with the help of a thin catheter. Despite it not being a common practice, many experts suggest couples should think of transferring a single embryo to circumvent the risk of multiple pregnancies. Extra embryos, if any, might be frozen in case of failure of this cycle. If the treatment succeeds an embryo will attach in your uterine wall and continue to become offspring.
In about 40 percent of ART pregnancies that are done with donor eggs, more than one embryo becomes implanted by itself and women give birth to twins or triplets.