PREGNANCY DUE DATE CALCULATOR

The Pregnancy Calculator can estimate a pregnancy schedule based on the provided data.

PREGNANCY DUE DATE CALCULATOR :

Last Menstrual Period :

Probable date of conception :

( about two weeks after last menstrual period )

Foetal Age Today :

Weeks Days

Best date range for NT scan :

( 12 wks 3 days to 13 wks 3 days )

19 Weeks / Morphology Scan Date :

Estimated Due Date (40 Weeks) :

On , you will be weeks days pregnant.

Previous Ultrasound Date and Foetal Age On That Day :

Weeks Days

How pregnant am I? Pregnancy by weeks, months, and trimesters

Figuring out exactly where you are in your pregnancy can be confusing. Read on for answers to the most common timing questions. Then check out the chart below to see how the weeks, months, and trimesters of pregnancy line up with each other.

Why is my pregnancy counted from the start of my last period?

Doctors and midwives start counting pregnancy from the first day of your last menstrual period (LMP) even though, of course, you weren’t pregnant then.

The first day of your LMP is typically about two weeks before you ovulated and conceived your baby. We count from there because most women don’t know exactly when they ovulated, but most of them do know when their last period started.

How is my due date calculated?

Your practitioner counts 280 days from the first day of your LMP to determine your due date. That’s exactly 40 weeks. Your due date is just an estimate, however. Only 5 percent of babies are born on their due date.

Use our Due Date Calculator to find out when your baby is due.

How long is each trimester?

There’s no official definition, but the trimesters are generally considered to be about three months each. At BabyCenter, you graduate to the second trimester the day you turn 14 weeks pregnant. The third starts the day you turn 28 weeks pregnant.

Does pregnancy really last nine months?

Of course, pregnancy is nine months long, right? Well, not exactly. For example, if your LMP started on January 1, your due date would be October 8 – or October 7 if it’s a leap year. So that’s more like nine months and one week. (And it’s even longer if you go past your due date.)

How can I tell how many months pregnant I am?

Find how many weeks pregnant you are on the chart below and scan back to see approximately how many months pregnant you are. (Note that you’re not one month pregnant until it’s been one month since your LMP.)

Isn’t a month four weeks long?

Actually, the only month that’s four weeks (or 28 days) long is February – that is, when it’s not a leap year. All the others are either 30 or 31 days. So, on average a month is 30.4 days long – or 4.3 weeks.

Pregnancy Term & Due Date

Pregnancy is a term used to describe a woman’s state over a time period (~9 months) during which one or more offspring develops inside of a woman. Childbirth usually occurs approximately 38 weeks after conception, or about 40 weeks after the last menstrual period. The World Health Organization defines a normal pregnancy term to last between 37 and 47 weeks. During a person’s 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. Alternatively, the Due Date Calculator can also be used to estimate due date based on a person’s last menstrual period.

While the due date can be estimated, the actual length of a pregnancy depends on various factors including age, length of previous pregnancies, and weight of the mother at birth.1 However, there are still more factors affecting natural variation in pregnancy term that is not well understood. Studies have shown that fewer than 4% of births occur on the exact due date, 60% occur within a week of the due date, and almost 90% occur within two weeks of the due date.2 As such, while it is possible to be fairly confident that a person’s child will be born within about two weeks of the due date, it is currently not possible to predict the exact day of birth with certainty.

Pregnancy Detection

Pregnancy can be detected either by using pregnancy tests, or by the woman herself noticing a number of symptoms including a missed menstrual period, increased basal body temperature, fatigue, nausea, and increased frequency of urination.

Pregnancy tests involve detection of hormones that serve as biomarkers for pregnancy and include clinical blood or urine tests that can detect pregnancy from six to eight days after fertilization. While clinical blood tests are more accurate and can detect exact amounts of the hormone hCG (which is only present during pregnancy) earlier and in smaller quantities, they take more time to evaluate and are more expensive than home pregnancy urine tests. It is also possible to get a clinical urine test, but these are not necessarily more accurate than a home pregnancy test, and can potentially be more costly.

Pregnancy Management

There are a number of factors that need to be considered during pregnancy, many of which are highly dependent on the individual’s situation, such as medication, weight gain, exercise, and nutrition.

Medication:

Taking certain medications during pregnancy can have lasting effects on the fetus. In the U.S. drugs are classified into categories A, B, C, D and X by the Food and Drug Administration (FDA) based on potential benefits vs. fetal risks. Drugs that have a positive benefit for the mother with low risk to the fetus are classified as category A, while drugs with proven, significant fetal risks that outweigh potential benefits to the mother are classified a category X. A person that is pregnant should consult their doctor regarding any medications they plan to use during their pregnancy.

Weight gain:

Weight gain is a largely inevitable and necessary aspect of pregnancy that varies between people. It affects many aspects of fetal development such as the weight of the baby, the placenta, extra circulatory fluid, and its fat and protein stores. Weight management merits consideration because insufficient or excessive weight gain can have negative effects for both mother and fetus including the need for cesarean section (C-section) and gestational hypertension. While the values vary between women, the Institute of Medicine recommends an overall pregnancy weight gain of 25-35 pounds for women who are considered “normal” weight (BMI 18.5-24.9), 28-40 pounds for those considered underweight (BMI < 18.5), 15-25 pounds for those considered overweight (BMI 25-29.9), and 11-20 pounds for those considered obese (BMI > 30).3

Exercise:

Studies indicate that aerobic exercise during pregnancy helps to improve or maintain physical fitness as well as possibly decreasing the risk of C-section. Although it varies between women, regular aerobic and strength-conditioning exercise are often recommended for pregnant women, and women who exercised regularly before pregnancy, who have uncomplicated pregnancies, should be able to continue high-intensity exercise programs.4 The American College of Obstetricians and Gynecologists suggests that given an uncomplicated pregnancy, fatal injuries are unlikely to occur as a result of exercise. Nevertheless, caution is advised, and a pregnant woman should consult their doctor if any of the following symptoms present: vaginal bleeding, shortness of breath, dizziness, headache, calf pain or swelling, amniotic fluid leakage, decreased fetal movement, preterm labor, muscle weakness, or chest pain.5

Nutrition:

Nutrition during pregnancy is particularly important for the health of the mother and baby. Pregnancy requires different nutritional considerations than a person would have in a non-pregnant state, due to increased energy and specific micronutrient requirements.6

Certain vitamins such as Vitamin B9, also known as folic acid, can help decrease the risk of certain defects, while other nutrients such as DHA omega-3 that is necessary for proper brain and retinal development cannot be produced efficiently by infants, and can only be obtained through the placenta during pregnancy, or in breast milk after birth. There are many other micronutrients that aid proper fetal development, and there exist myriad sources of information on what pregnant women should or shouldn’t eat or do.

All of the information can be different to sift through and can vary from person to person. Pregnant women should consult their doctors and/or dietitian to help determine the best course of action for their own specific needs.