![]() If your menstrual period is shorter, this means that you ovulated earlier in your cycle and that your estimated due date will be earlier. If your menstrual cycle is longer, this means you ovulated later in your cycle and that your estimated due date will be later. Your menstrual cycle may be as short as 21 days or be as long as 35 days. However, the length of a menstrual cycle differs between people. The average menstrual cycle is around 28 days. How does my menstrual cycle affect my due date? Only about 4 out of every 100 babies are born on their actual due date. Babies are considered ‘term’ and are usually born anywhere between 37 and 42 weeks of pregnancy. The exact timing of your baby’s birth is unpredictable. It's important to understand that your due date is only an estimate. If this happens to you, your doctor or midwife will explain which is most accurate according to your individual circumstance. Ultrasounds, particularly those done in your first trimester, are generally very accurate at dating your pregnancy, but sometimes there can be a difference in the due date when comparing LMP and ultrasound dates. Later in pregnancy, your doctor can measure different parts of your baby’s body, including your baby’s head, thigh bone and abdomen to work out an average size and an estimated due date. This is called the crown-rump length or CRL. In early pregnancy (usually before 13 weeks) your doctor will measure the length from your baby’s head to your baby’s bottom. By measuring your baby’s size, doctors can work out how far along your pregnancy is. If your cycle is longer or shorter than 28 days or irregular, working out your due date using the first day of your LMP can be more difficult and may also be more unreliable.Īnother way your due date can be calculated is by using ultrasound. For example, if you have a regular 28-day cycle, add 7 days to the date of the first day of your last period, then add 9 months. This method is particularly accurate if you have a regular menstrual cycle. Your baby will be ‘due’ around 40 weeks after the first day of your LMP. You can calculate your baby’s estimated due date based on the date of the first day of your last menstrual period (LMP). This can be done by working out your estimated due date. Related information on Australian websitesĪfter finding out you're pregnant, you will want to know how pregnant you are and when your baby is likely to be born.Why is it important to have an accurate due date?.How does my menstrual cycle affect my due date?.When you have your first appointment with your doctor or midwife, they will help you work out your due date.It is important to have an accurate due date so that you and your healthcare team can monitor your pregnancy and baby’s growth and to help keep you and your baby safe.Although babies are usually born between 37 and 42 weeks of pregnancy. The average length of a pregnancy is generally about 40 weeks.Your due date is an estimation of when your baby may be born.You can calculate your estimated due date based on the date of the first day of your last menstrual period or with ultrasound (LMP).
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