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Pregnancy can be calculated two ways. The most common way is to start counting from the first day (when you started bleeding) of your last period. Most OBGYN offices use this and will give you your EDD(estimated due date) from this.

The less common way is to start counting from the day you ovulated. So few women know the exact date they ovulate that this is not a widely used method. This is usually reserved for women how have undergone medical treatments to become pregnant.

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13y ago

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Cow and Gate have a pregnancy calculator on their website, or you could just add 9 months and 1 week to the date of the first day of your last period. The only accurate calculation is the first scan.


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It can either be calculated by the date of ovulation if you know the exact date or you can calculate by the first day of your last period.


How can a pregnancy calculator be used to find a baby's due date?

A pregnancy calendar is used to calculate a baby's due date. A due date calculator asks for the first day of your last period which will then calculate the number of days you are pregnant and when your baby is due to be born.


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When do insurance companies consider the start of a pregnancy. First OBGYN appt or the date they calculated that one conceived?

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