Sometimes calculating your due date is confusing! After reading some of our "did you know?"
information on cycle length and due date calculation,
use our handy due date calculator to get the right date!
Click here to go directly to calculator
Did you know???
Some important information on your cycle
Did you know???
Some important information on the calculation of pregnancy due dates
Even when we go to see our doctors when we find out we are pregnant, we don't seem
to get the right due date! Why are we getting mis-information? Here are some reasons
why, and some information that you should know.
One point of confusion many women encounter is the calculation of due dates. "If I conceived
a few weeks ago, why does the pregnancy wheel say I am 5 weeks pregnant?" is a common type of
question.
Did you know that although an average pregnancy is counted as being 40 weeks long,
you are only pregnant for 38 of those? The first two
weeks you are "pregnant" are actually the first two weeks of your cycle - from the time
you start your period (Day 1 of your cycle) to the day you ovulate and conceive your
baby (the average for women is Day 14).
Another point of confusion is the discrepancy between the time we think we actually
conceived and the time the doctors seem to think we did! This is often because our
doctors use a pregnancy wheel that assumes a 28-day cycle. The problem with using
this little wheel though, is that many women do not have the "average" 28-day cycle!
Although the "average" cycle is 28 days long, this is not always the case, which means
women are not always ovulating on the 14th day of their cycle like that little wheel assumes.
The myth of "day 14" is very common, and has certainly lead to more than a few miscalculated
due dates (not to mention unplanned pregnancies!). Women have
menstrual cycles that can be short (e.g. 26 days between two periods) or long (e.g.
40 days between two periods). If the pregnancy wheel is used to calculate their due
dates based on a 28-day cycle, the dates could be off. For example, a woman with a 35-day
cycle will be told she is 6 weeks pregnant because her last period
started 6 weeks ago. However, she may be only 5 weeks pregnant since
she ovulated about a week or more later than the "usual" 14th day.
Given this information, it's no wonder women like you and I are more trusting of online
pregnancy calendars (that take into account our cycle length and luteal phase length),
than we are of those pregnancy wheels at the doctor's office!
YMHS Recmomends!
There are a lot of great resources out there now that promote increased awareness of the
female cycle as birth control, pregnancy acheivement, or even just a way of knowing
more about our bodies! Our top recommendation is what is often referred to as the
"Bible" of fertility or as "TCOYF". Please check out this great resource for even more information about
your fertility and your own unique cycle:
Taking Charge of Your Fertility
by Toni Weschler

Using the information above on correct calculation
of your cycle dates, enter your unique cycle length and unique luteal phase length
below to get an accurate pregnancy due date.
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