The time of conception is usually 2 weeks after your last normal period.
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The first due date that your provider tells you is usually based on your last menstrual period and the size of your uterus at your first visit. Read Also: Do You Get Cramps Before Your First Period How Does My Provider Decide My Due Date However, its not uncommon for a doctor to perform an ultrasound in the third trimester if theyre thinking about changing your date. Estimates based on an ultrasound can be off by as much as three weeks, so doctors rarely adjust dates during the third trimester. The third trimester is the least accurate time to date a pregnancy. In the second trimester, an ultrasound is less accurate and your doctor probably wont adjust your date unless the estimates vary by more than two weeks. This is most likely to occur in the first trimester, especially if the date estimated by the ultrasound differs by more than one week from the date estimated by your doctor based on your LMP. Your doctor may change your due date based on the ultrasound measurement.
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Generally, your doctor orders an ultrasound to determine the gestational age of your baby when theres a history of irregular periods, when the date of your LMP is uncertain, or when conception occurred despite oral contraceptive use.Īn ultrasound allows your doctor to measure the crown-rump length the length of the fetus from one end to the other.ĭuring the first trimester, this measurement provides the most accurate estimation for the age of the baby. Your doctor may change your due date if your fetus is significantly smaller or larger than the average fetus at your particular stage of pregnancy. What Does It Mean If My Doctor Changes My Due Date Still, you can try our Ovulation Calculator, which uses the date of your last menstrual period and your typical cycle length to discover the days you’re most likely to be fertile and increase your chances of conceiving. But even if you’re one of the lucky ones who’s able to get pregnant when she really wants to, just remember that you probably won’t be able to map out exactly when you’ll give birth to the day. Whether you’re trying to avoid being very pregnant in the middle of summer or are a teacher who wants to maximize time off with your little one, you can try to time when you conceive in order to “plan” your due date. This study shows that early dating ultrasounds dont change the incidence of induction. Note that you dont have to have an early ultrasound, especially if you are fairly certain of your cycle length and conception window. As a result, your midwife or doctor may change your due date based on the ultrasound gestational age.Įarly ultrasounds are very accurate when dating a pregnancy and can be helpful if you dont know your LMP or your periods are irregular. If there are significant differences in the dates, your doctor may want to dig deeper to determine conception date. Its normal for these dates to not match up perfectly. This figure is based on how the baby is measuring, not on your LMP, which the due date calculator uses.
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If you get an ultrasound you may notice a GA on the image with a number of weeks and days. Gestational age is the term used to describe how far along the pregnancy is and how long baby has been gestating.
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