It will either be a dating scan or the nuchal translucency (NT) scan, and gives you a more accurate due date, based on the size and development of your baby. Your due date is an estimate of when you will likely have your baby, based on the normal length of a full-term pregnancy. Your first pregnancy scan will probably happen when you're between 10 weeks and 14 weeks pregnant. The EDD can then be calculated by adding 266. Will my due date change when I have a scan? Calculation of the best estimated due date (EDD) is based on the day of the date of ovulation and fertilization. Knowing this can help you to be prepared for labour and birth, and to have everything ready for your new baby. During a persons first OB-GYN visit, the doctor will usually provide an estimated date (based on a sonogram) at which the child will be born, or due date. In fact, only about four per cent of babies are born on their due date! But it's likely that your baby will arrive in the few weeks either side of your estimated due date. Most babies will actually arrive somewhere between 37 weeks and 42 weeks. Unfortunately, no one can say for sure exactly when your baby will arrive. Due date is based on your baby arriving 40 weeks after your last menstrual period. Will my baby definitely be born on my due date? Our calculator uses this information to give you an estimated due date. The average pregnancy lasts between 37 weeks and 42 weeks. The first day of your LMP is considered day one of. Most people will ovulate about two weeks before the first day of their period, and conceive shortly afterwards. Pregnancy lasts an average of 280 days (40 weeks) from the first day of your last menstrual period (LMP). If you deliver on your due date, your baby is actually only 38 weeks old, not 40. Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. That's why your due date is calculated based on the date of your last period instead. Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Unless you've been tracking your ovulation, there's no way to know for sure exactly when you ovulated and conceived. INSTRUCTIONS Enter last menstrual period (LMP), current gestational age (GA), OR expected due date to determine the other two, plus estimated date of conception. Have you tried adding, subtracting, multiplying and counting on your fingers? Find out when your baby is due with our handy pregnancy calculator. Calculates pregnancy dates, forward from last period or backward from due date.
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