Baby dating ultrasound

You can calculate your due date by subtracting three months from the first day of your last menstrual period (LMP) and then add a week. A pregnancy is based on being 280 days long, which is 40 weeks (more like 10 months not 9! When we give you a due date we consider 37 to 42 weeks to be full-term, so even if your baby is born two weeks before your due date it is not considered premature.

National guidelines say that women should be offered at least two scans.Speak to your doctor if there are things you don't understand or if you have any concerns after the scan.There are two ways of doing a first trimester scan: Transvaginal scan (TVS) If your doctor wants you to have a scan earlier than 10 weeks of pregnancy, you will have a transvaginal scan.Drink 0.5 Ltr (1 pint) clear fluid approx 1 hour before appointment time.Please do not empty your bladder before the examination.

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However, if the doctor needs to check your cervix (mouth of uterus and birth canal), a transvaginal scan may be done as it is more accurate.

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