The process of embryo transfer entails virtually no risks. According to the German Embryo Protection Law, the number of embryos capable of development created per cycle may not exceed the number to be transferred to the patient (a maximum of three).
Transferring two ideal embryos leads to pregnancy after IVF therapy in 44 percent of embryo transfers in under-30s, and around 27 percent for 40-year-olds (DIR 2015). Of these, around 22 percent become pregnant with twins.
After embryo transfer of three embryos, on the other hand, up to 27 percent of the pregnant women become pregnant with twins and up to 4 percent with triplets. A multiple pregnancy can, however, be dangerous for both the expectant mother and the children. It is therefore considered to be a high-risk pregnancy. For this reason, triplet pregnancies in particular should therefore be avoided at all costs. In countries with selective blastocyst culture, only one embryo per transfer is therefore inserted in the uterine cavity, and only in cases of reduced pregnancy chances are multiple embryos transferred.
If a pregnancy occurs after an embryo transfer, the pregnancy hormone hCG formed by the pregnancy can lead to hyperstimulation syndrome. This can cause the ovaries to enlarge and can result in water retention in the stomach and chest area. In the worst case, hospitalisation may be necessary. In any case, an individual consultation and explanation will be provided by the treating physician, taking into account your personal circumstances and any concerns you may have.