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OB-GYNs can also use a pregnancy wheel (like the one below) as a pregnancy timeline calculator to work out when you’ll have certain scans and screenings, along with your trimester dates. Sometimes it has been seen that the baby arrives before the due date, and only a few babies are born on the exact date! A pregnancy wheel or gestation calculator is a simple calendar that works out your due date or baby’s birth date based on different inputs, such as your LMP. It may vary according to the baby's development. No one can surely mention your due date after your first scanning is done between 6-9 weeks of pregnancy The actual date of conception is when fertilisation is done. Many times women don’t know the exact date she has conceived, even she knows when she had sex because sperm is alive in the fallopian tube even after the five days of copulation. Knowing when an expecting mom has conceived is quite challenging to find. Taking the last day of your missed period as the base, the due date is calculated. Giving birth after 38-40 weeks of pregnancy is a good sign that your baby is appropriately developed in the womb. The duration of your pregnancy should be 40 weeks or 280 days, that is, the completion of nine months of your pregnancy. There is nothing that makes sure you’re pregnant. The best way to know the due date is to keep track of your menstrual cycle or the date you have conceived. The rest will be a pregnancy calculator, calculate! How is the Due Date Calculated? Next, enter the missed period date and duration of your menstrual cycle. If you’re not aware of the conception date, your due date is calculated on the basis of missed period. The first and the most simple way is to enter the confirmed conception date. There are methods by which this calculator works. How Pregnancy Calculator Works?Ī missed period is a sure sign of pregnancy, and after knowing the news that you’re pregnant! You may be excited to know the due date or the date for your baby's arrival. Wondering about the estimated delivery date and counting days on fingers? Calculate your baby's arrival date with a pregnancy calculator. Estimate date of delivery.Pregnancy Calculator helps you to find your estimated due date based on the date of your conception or LMP date. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. American Journal of Obstetrics and Gynecology.American College of Obstetrics and Gynecology.Assessing fetal development, particularly crown-rump length (CRL), gives a precise gestational age needed for estimating the baby's due date. Due Date by UltrasoundĪlso called a dating scan, an ultrasound in the first trimester is the more accurate method of establishing the baby's gestational age and the respective pregnancy due date, especially in the case of women not knowing their LMP as well as those with irregular periods, irregular ovulation, or suspected pregnancy complications.įrom the fifth week of gestation, the first structures of the developing embryo can be monitored through a transvaginal or transabdominal ultrasound. As such, most women find it easier to recall their LMP rather than their ovulation. For this method to be accurate, a woman has to be tracking ovulation since conception can only occur in that 24-hour window since egg release. It involves counting 38 weeks, or 266 days, from the day a woman has conceived.

Due Date by ConceptionĪnother possible method of obtaining the pregnancy due date is based on the conception day. It is worth noting that in the first two weeks of gestation, a woman is not actually pregnant yet.

This method is the most accurate for women with regular, 28-day menstrual cycles with ovulation taking place on Day 14. It consists of adding 40 weeks, or 280 days, to the first day of the last menstrual period (LMP). The most common initial method of calculating the baby's due date uses a woman's last menstrual period. They include the following: Due Date Based on Last Period There are three main ways through which an estimated due date can be obtained.