My gynae did mention it to me when I was pregnant, and from what I recall it is usually done in the first trimester as a screening tool to assess your risk level. Whether it is necessary can depend on your individual health profile and your gynae's assessment, so there is no one-size-fits-all answer really. I think it is worth having a direct conversation with your gynae about why they are recommending it for you and what the results would mean for your care. Some gynaes offer it routinely, others only if there are risk factors, so your gynae is honestly the best person to weigh in on whether you need it.
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