If you use donor eggs, the egg donor completes the first two parts of the IVF cycle and you complete the third, meaning that the donor undergoes hormone stimulation and egg collection (refer to Chapter 5 for more on these procedures). When the eggs have been recovered, your partner's sperm is added to the eggs and two to five days later, when the embryos are formed, you undergo embryo transfer. In preparation for embryo transfer you need to take a course of oestrogen tablets and progesterone, which ensures that the lining in your uterus is just right for the embryo to implant (for more on IVF drug protocols, refer to Chapter 6). After transfer you have to keep taking oestrogen and progesterone for up to ten weeks if you're pregnant, but after ten weeks your placenta produces enough hormones to maintain the pregnancy.
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