How To Calculate Due Date

You would see this on your pregnancy and medical book/chart as EDD. EDD stands for expected due date and is calculated usually based on your last menstrual cycle date and also at times looking at the growth of the baby and how many weeks into pregnancy you are. Being informed helps us in various ways. 

Gestation Period For Humans 

Importance Of Tracking Ovulation 

Calculating Your Due Date 

Why The EDD Dating System Sometimes Does Not Work? 

Is It Possible That The Due Date Could Change?

The clues that can help your practitioner determine your EDD are: 

• Size of your uterus: 

This is noted when you undergo the first internal pregnancy scan/examination. 

• Early ultrasound: 

This is effective in understanding the stage/status of your pregnancy. However, an early ultrasound may not work out for some women. Most practitioners will recommend this when you have irregular periods, to accurately identify when you would have possibly conceived. At times your age, such as being over 35 years, along with the history of pregnancy complications/miscarriages could also be the reason why an early ultrasound might have been prescribed. 

• Pregnancy milestones: 

This could help in determining the EDD. Milestones such as the first time the fetal heartbeat is heard could be one of them - this would usually occur at 9th to 12th week of pregnancy. Your fetal movement for the first time is also a milestone that usually occurs between 16 to 22 weeks. These milestones work as clues to determine if the identified EDD is accurate. 

• The fundal height: 

The top of your uterus would be measured by your practitioner each time you visit for a checkup. At about 20 weeks, your fundus should have reached your navel. This also helps in confirming the EDD.