Content

• Steps
• Method 1 of 3: Counting Based on Your Last Menstrual Period
• Method 2 of 3: Using an Online Calculator
• Method 3 of 3: Consult a Doctor
• Tips

When you find out that you are pregnant, then one of the first questions that you may have is "When should I give birth?" Since the date of conception is rarely known, you can find out the date of birth if you remember the date of your last menstrual period, which preceded a positive pregnancy test. However, the estimated due date (PDD) is just a rough estimate of the baby's date of birth. Only 50% of babies are actually born on their DA, but you need to have a general idea of ​​when your baby is due to be born in order to track its progress and development.

Steps

Method 1 of 3: Counting Based on Your Last Menstrual Period

1. 1 Determine the date of your last menstrual period, which was before you discovered you were pregnant. This method works best in women with a menstrual cycle that lasts about 28 days.
2. 2 Add 40 weeks from this date to determine the DA. Pregnancy usually lasts: 9 months, 40 weeks, or 280 days - add or subtract a few weeks from your last period.
3. 3 Another option is to use the Negele rule. The easiest way to calculate PDR is to take the first day of your last period and count back 3 months, add 7 days to the resulting date, and then add another whole year. This is called the Negele rule.
4. 4 Choose other methods to calculate your PDD if you do not remember your last menstrual period or if you have an irregular period. In this case, it can be difficult to determine the DA without additional help.To calculate it more accurately, you will have to wait for a doctor's examination and do an ultrasound scan, which will determine the intrauterine age of the fetus and PDD.
   • However, you may be able to calculate an approximate result. For most women, ovulation begins 14 days before menstruation. Assuming your menstrual cycle is 40 days long, your ovulation is estimated to be on day 26. If you know the day (s) of ovulation, just add 266 days to that date to get a very approximate date of your baby's expected birth.

Method 2 of 3: Using an Online Calculator

1. 1 Look for a free PDR honor calculator. Search for the keyword "free due date calculator", and then go to a resource that looks like a credibility judge.
2. 2 Enter the date of conception or the first day of your last period. Since it is obvious that not many people know the date of conception, many online calculators advise using the date of your last menstrual period, which will be used to calculate the PDR.

Method 3 of 3: Consult a Doctor

1. 1 See a doctor. Determining the PDD yourself or using an online calendar will give you a rough idea of ​​the PDD, and the doctor will be able to determine the length of your pregnancy. At your first consultation, your doctor may order you to have a vaginal ultrasound to more accurately determine the PDD.
   • Ultrasound more accurately identifies PDD in early pregnancy. Subsequent ultrasounds will check if the fetus is developing correctly, but will not help determine the age of the fetus.
2. 2 Be prepared for a little uncertainty. The DA is not fixed once and for all, and should not be so. Your child will be born when he is ready for this and we will eat up not a day later or earlier than this date. So DA is more of a process. Some pregnant women even had their PDE changed in mid-pregnancy.

Tips

• Determining your expected due date on your own is ideal if you have a 28 day menstrual cycle. If your period is irregular, it is best to consult with your doctor to determine when you are pregnant.
• A normal pregnancy can last 38 to 42 weeks. 40 weeks is the average duration of pregnancy.
• Your expected due date may change if you have multiple pregnancies, for example, if you are pregnant with twins or triplets. Most multiple pregnancies do not reach 40 weeks, and some doctors may induce labor based on indications of fetal development.