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Last time I did it, the standard was one scan at about 6 weeks (or whenever you first came in) to confirm pregnancy, and count the number of fetuses. Then one at 20 weeks to check gender and look for any abnormalities. If there were problems at that point, you were likely to have frequent ones thereafter, but if not, you probably wouldn't have another one unless the doctor asked for one just before delivery, to measure the size of baby, or check presentation, or make sure there was enough amniotic fluid left if the baby was looking like it might go past 40 weeks.
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