cheduled before ovulation in IVF, thus making it more accurate.
The IVF due date is calculated by adding 38 weeks (i.e., 266 days) to the day the eggs were inseminated.
An alternative calculation is by adding 38 weeks to the date of transfer, and subtract the age of embryos from this date. For instance, if it is a three-day embryo transfer, subtract three days and if it is a four-day embryo transfer, subtract four days (11).
It, therefore, gives reliable estimated due dates. Also, with progressing pregnancy, the estimated due date could be more accurate based on ultrasound scans.
[Read: Chemical Pregnancy And IVF ]
Week-to-Month Pregnancy Chart:
If these calculations are making you go nuts, there is a simple breakdown on how the pregnancy weeks, months, and trimesters line up with each other.
If You Are In Your Fifth Week Of Pregnancy, Why Are You Referred To As Four Weeks Pregnant?
Sarah Owen, author of “The Complete Guide To Pregnancy And Child Care”, helps clear the confusion about pregnancy weeks by relating them to a baby’s age. When a baby is one year old, she completes the first 12 months of her life. Though she enters the second year, she is called one-year-old. Similarly, when you complete the first week of pregnancy, you are known to be one-week pregnant even though you enter the second week.
A quick look to understand the terms and counting of pregnancy weeks:
- In your first week of pregnancy, you will be referred to as being zero weeks pregnant
- In your second week of pregnancy, you will be referred to as being one week pregnant.
- In your third week of pregnancy, you will be referred to as being two weeks pregnant.
- And so on.
It is for this reason that when you miss your first period, you are four weeks pregnant though you are in your fifth week of pregnancy (i.e., starting of a new month).
How Accurate Is Your Pregnancy Due Date Calculation?
Due dates are just estimates, which differ from one pregnancy to another. According to a British study, only 4% are known to be born on their due date, and 90% are born before or after the due date (12). Most babies arrive in between 37 and 41 weeks of pregnancy.
The above methods of calculating your pregnancy weeks and months will give you a rough idea of how far you have been into your pregnancy. It is also important to understand that every pregnancy is different, and this is just a guide. Do not get stressed on the exact calculations.
However, you should consult your health practitioner if you have any questions about your due date and pregnancy week calculation.
How did you calculate your pregnancy due date? Tell us in the comments section below.
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