Read our report on the 13 best pregnancy iPhone and Android apps of the year here. The other way to calculate your due date is to use a pregnancy wheel. This is the method that most doctors use. The first step is locating the date of your LMP on the wheel. When you line up that date with the indicator, the wheel displays your due date. Remember that the due date is only an estimate of when you will deliver your baby.
The chances of actually having your baby on that exact date are very slim. Some women have cycles that are consistently longer than the average day cycle. In these cases, a pregnancy wheel can still be used, but some simple calculations are necessary.
This is the time from ovulation to the next menstrual period. If your cycle is 35 days long, for example, then you probably ovulated on day Once you have a general idea of when you ovulated, you can use an adjusted LMP to find your due date with a pregnancy wheel. For example, if your menstrual cycle is usually 35 days long and the first day of your LMP was November After you calculate your adjusted LMP date, simply mark it on the pregnancy wheel and then look at the date where the line crosses.
That is your estimated due date. Some pregnancy wheels may allow you to enter the date of conception — which occurs within 72 hours of ovulation — instead of the date of your LMP. 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.
An ultrasound allows your doctor to measure the crown-rump length CRL — the length of the fetus from one end to the other. During the first trimester , this measurement provides the most accurate estimation for the age of the baby. Your doctor may change your due date based on the ultrasound measurement. 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.
So is knowing about pregnancy trimesters and how to translate weeks to months in pregnancy. Our pregnancy weeks and months chart will help! To determine your due date, healthcare providers count 40 weeks from the first day of your last menstrual period LMP rather than trying to guess exactly when sperm met egg. Visit our Pregnancy Due Date Calculator to check how many weeks pregnant you are. Healthcare providers use your LMP to date pregnancy because many women don't know which day they ovulated.
And even if you know the day you had sex that resulted in pregnancy, that may not be the day you conceived : Sperm can linger in your uterus for up to five days waiting for an egg to be released so they can fertilize it. Using your LMP to find your due date means that when you get confirmation that you're pregnant, you'll most likely be 4 or 5 weeks along.
There are 40 weeks in a pregnancy — though you're just as likely to deliver your baby a few weeks before or after that. Each trimester is 13 or 14 weeks long. The first trimester lasts until you're 13 weeks pregnant, the second trimester spans week 14 to week 27, and the third trimester starts the day you turn 28 weeks pregnant and lasts until week 40 or until you deliver your baby. There are three trimesters: the first trimester early pregnancy , the second trimester mid-pregnancy , and third trimester late pregnancy.
Check out our chart to see how the weeks, months, and trimesters of pregnancy line up with each other. You can use the chart above to figure out how the weeks of pregnancy correspond to months. Note that you're not technically one month pregnant until after 4 weeks have passed, for example. But you are "in your first month" during the first 4 weeks and "in month nine" during the last 4 weeks.
Actually, in a typical year, February is the only month that's four weeks or 28 days long. All others are either 30 or 31 days. On average, a month is 4. And that's why some months in the chart are four weeks long and some are five weeks long.
Forty weeks is actually a little more than 9 months. For example, if your last period started on January 1, your due date would be October 8. So that's more like nine months and one week or even longer if you go past your due date.
Your provider counts days 40 weeks from the first day of your LMP to determine your due date. Use this pregnancy calculator to find your due date based on the date of your last menstrual period, conception date, IVF 3-day or 5-day transfer date or date of your last ultrasound.
Calculation Method. The first day of your last period. Date of Conception. Date of Transfer. Date of Ultrasound. Medically Reviewed by Aaron Styer, M. Medical Review Policy All What to Expect content that addresses health or safety is medically reviewed by a team of vetted health professionals.
How to Calculate Your Due Date. First day of last period Most pregnancies last around 40 weeks or 38 weeks from conception , so typically the best way to estimate your due date is to count 40 weeks, or days, from the first day of your last menstrual period LMP. Conception date Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle. IVF transfer date There are more than , assisted reproductive technology cycles performed each year in the United States, resulting in about 77, or more babies born a year, according to the Centers for Disease Control and Prevention CDC.
The size of your uterus, which will be noted when your initial internal pregnancy exam is performed, can also be a factor in pinpointing the EDD. Can I plan my due date? Can my due date change?
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