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Back up sample
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Semen sample frozen in case it is later needed
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Beta hCG (bhCG)
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The part of the hCG molecule measured in most pregnancy tests
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Biochemical pregnancy
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A pregnancy at an early stage before the fetus or sac can be seen by ultrasound, which can be monitored by bhCG levels in blood
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Blastocyst
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An embryo stage just before implantation, usually 50 - 150 cells, occurring 5 - 6 days after fertilisation
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Buserelin
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Name of a drug used to "turn off" the hormones FSH and LH
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