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What exactly do we need to submit for the second screening? The clinic said only urine and that's all, on the first screening I just had blood tests and many other analyses, but for the second screening I don't understand, then ultrasound is mandatory at 20 weeks, should it be taken at 19 weeks or can it be done at 19 weeks? Please tell me, I don't understand much more, there is different information online, I haven't found any specific answer.