Track your pregnancy
Get expert guidance and personalized insights to stay healthy through every week of your pregnancy.
Get the app!How can I calculate important week-by-week information throughout my pregnancy?
This pregnancy calculator helps you find out exactly how many weeks pregnant you are right now, details your baby's development, and precisely what is happening to your body at the moment. Just enter your pregnancy due date or other information to create and calculate a personalized weekly and daily pregnancy calendar. The babyMed Monthly Pregnancy Calculator and Calendar is a week-by-week pregnancy calculator and calendar with information for each day of your pregnancy.
To create a Week-By-Week calendar choose from the following options:
- Weekly Count: Follow new developments in weeks and days
- Daily Countup: Count up how many days you are into your pregnancy
- Daily Countdown: Count down your days left until your due date
- Fetal Weight: Available in ounces or grams
- Ultrasound measurements: BPD, FL, HC, AC
The chart below provides links to detailed information about what happens each week during pregnancy.
1st Trimester2nd Trimester3rd Trimester1 wk pregnant14 wks pregnant27 wks pregnant2 wks pregnant15 wks pregnant28 wks pregnant3 wks pregnant16 wks pregnant29 wks pregnant4 wks pregnant17 wks pregnant30 wks pregnant 5 wks pregnant18 wks pregnant31 wks pregnant 6 wks pregnant19 wks pregnant32 wks pregnant 7 wks pregnant20 wks pregnant33 wks pregnant 8 wks pregnant21 wks pregnant34 wks pregnant 9 wks pregnant22 wks pregnant35 wks pregnant 10 wks pregnant23 wks pregnant36 wks pregnant 11 wks pregnant24 wks pregnant 37 wks pregnant 12 wks pregnant25 wks pregnant 38 wks pregnant 13 wks pregnant 26 wks pregnant39 wks pregnant 40 wks pregnant 41+ wks pregnantDon't know your due date? Use our Pregnancy Calculator to find out the exact due date, with dates for exciting pregnancy events.
“When exactly did I get pregnant” is a difficult question to answer precisely because calculating conception is done by using the first day of your last menstrual period or an ultrasound date.
Use our Pregnancy Calculator to calculate these dates for you.
Calculating Gestational Age
Last Menstrual Period
If the mother has a regular period and knows the first day of her last menstrual period, gestational age can be calculated from this date. Gestational age is calculated from the first day of the mother’s last menstrual period and not from the date of conception. A pregnancy wheel is often used to calculate gestational age.
Ultrasound
The baby can be measured as early as 5 or 6 weeks after the mother’s last menstrual period. Measuring the baby using ultrasound is most accurate in early pregnancy. It becomes less accurate later in pregnancy. The best time to estimate gestational age using ultrasound is between the 8th and 18th weeks of pregnancy. The most accurate way to determine gestational age is using the first day of the woman’s last menstrual period and confirming this gestational age with the measurement from an ultrasound exam.
Calculating Conception Date
In a Typical Pregnancy
For a woman with a regular period, conception typically occurs about 11-21 days after the first day of the last period. Most women do not know the exact date of conception because it can be challenging to know exactly when ovulation occurs. Thus, their conception date is merely an estimate based on the first day of their last period.
Special Cases
Women who undergo special procedures, such as artificial insemination or in vitro fertilization, typically know the exact date of conception.
Calculating Estimated Due Date
Based on the last menstrual period, the estimated due date is 40 weeks from the first day of the period. This is just an estimate since only about 5% of babies are born on their estimated due date.
Difficulties in Determining the Gestational Age
Last Menstrual Period
For women who have irregular menstrual periods or women who cannot remember the first day of their last menstrual period, it can be difficult to determine gestational age using this method. In these cases, an ultrasound exam is often required to determine gestational age.
Baby’s Growth
In some cases, it is difficult to determine the gestational age because the baby is unusually large or small. Also, in some cases, the size of the uterus in early pregnancy or the height of the uterus in later pregnancy does not match the first day of the last menstrual period. In these cases as well, it is difficult to obtain an accurate gestational age.
Want to Know More?
- Baby Development Month by Month Video
- 7 Common Discomforts of Pregnancy
- Vitamin D and Pregnancy
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