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Pregnancy timeline

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A timeline of some of the key changes to mother and baby during pregnancy. WEEKS 1-9 WEEKS 10-19 WEEKS 20-29 WEEKS 30-birth WEEKS 1-9 In the UK pregnancy is calculated from the first day of the woman’s last period so for as much as three weeks of this first month she might not be actually pregnant. The fertilized egg begins as a single cell which quickly multiplies to form an embryo as it travels towards the womb. The embryo attaches itself to the womb lining, which is already thickening to support it. For many women the first sign of pregnancy is a missed period in week five. Shop-bought tests are considered largely reliable so the mother-to-be does not have to have her pregnancy confirmed by her GP. If a first test is negative a second one a few days later may prove positive as hormone levels in the urine rise. The embryo is now about the size of a baked bean and its spine and nervous system begin to form. It already has its own blood system and may be a different blood group from its mother. Blood vessels are forming in what will become the umbilical cord and tiny buds which will become limbs The baby