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. But keep in mind that's just an estimate. Only 5 percent of babies are born on their due date. You're just as likely to deliver any time during the two weeks before or after that day. Your baby is considered full term between 39 and 41 weeks. Note: Not everyone ovulates exactly two weeks after their LMP, so your due date may be adjusted if an early ultrasound indicates that your baby is more or less developed than expected.
BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies. Definition of term pregnancy.
American College of Obstetricians and Gynecologists. Skin changes. The dark patches you may have on your nose, cheeks, and forehead are a common condition of pregnancy called chloasma, or the "mask of pregnancy. Pregnancy hormones are also responsible for the linea nigra, the dark line running down your belly to your pubic bone.
Both chloasma and the linea nigra will gradually fade after you give birth. Exposure to the sun can darken the pigments in your skin even more, so be sure to use sunscreen or stay in the shade. Round ligament pain. As your uterus grows, the round ligaments supporting it have to stretch. Occasionally, these stretched-out ligaments will cause a sharp pain or a dull ache in your lower abdomen, usually on one side or the other. It's probably most noticeable when you change positions or get up suddenly.
Rest usually offers the best relief. Call your doctor if the pain comes with a fever, chills, painful urination, or bleeding, or if the pain is severe. Lower back pain. Backaches are among the most common pregnancy complaints, especially from the halfway point of your pregnancy onward.
This is due to your growing uterus and the hormonal changes going on in your body. As your center of gravity shifts, your expanding uterus strains your back muscles. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period.
You need to know the first day of your last period to use this calculator. If you do not know it or are unsure, speak to a midwife or GP. As part of your pregnancy antenatal care , your midwife will offer you a week scan that may give you a more accurate date for the birth of your baby. Learn more about our editorial and medical review policies. 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.
Another way to do it is to subtract three months from the first day of your last period and add seven days. So if your last period started on April 11, you'd count back three months to January 11 and then add seven days, which means your due date would be January Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle.
But if your cycle is irregular, the LMP method may not work for you. Because a reliable estimated date of delivery EDD is important, you and your practitioner can use your conception date instead if you remember it. Just add days to get your estimated due 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.
If you are part of the growing tribe of in vitro fertilization IVF moms, you can calculate your due date more precisely using your IVF transfer date. An early ultrasound, which can more accurately date the pregnancy.
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