When Will Child Born - How to Count Weeks Calendar

To know when a child will be born brings to my mind a question how to count weeks calendar.  After checking, there are a wide number of free calculators available that help us count the number of weeks we have been pregnant and determine due date. 

Many use a formula called Naegle's Rule to calculate the number of weeks based on a set point (the date of you started your last menstrual period) and count forward 40 weeks for a due date.  Most accurate way to count weeks is based on normal pregnancy duration of 38 weeks that assumes you became pregnant exactly two weeks after your period.

Things are Find, or estimate, the date of the first day of your last period (LMP).

Count backward three months from that date, then plus seven days. This will be approximate due date. Even though you are counting backward, the date is the next occurrence of that date. For example, a LMP in February should give you an approximate due date in November.

Use your approximate due date to the count backward, week by week, to count which week of pregnancy you will be in during which set of dates.

Carefully tick a calendar to check pregnancy milestones. 

Pinpointing the exact date of conception may be difficult without the use of ultrasound, but it can be predicted by using the first day of your last menstrual period (LMP) and a calendar.
A full-term pregnancy ranges from 38 to 42 weeks, with only 5 percent of babies are eager to see us on day 280. The other 95 percent are born either before or after the 280-day mark.

Tips & Warnings

• Calendar weeks indicate trimesters you are in. But dates can be influenced by short or long ovulation periods.  So keep in mind that the pregnancy is different in each woman.
• Implantation bleeding can be interpreted as LMP.
• Early ultrasound is strongly advised.

Do not worry too much, you can leave this job to doctors and husbands who may have better skill in math to count number of calendar weeks and so on.  Should we discuss this issue in another blog.