answersLogoWhite

0


Best Answer

doctors dont know how to calculate it, cause half the time the mothers arent sure exactly when they got pregnant, all they know is, that it was between the time of their last period and their doctors appointment ....pregnancy starts on the day u had sex and something got leave behind ...

User Avatar

Wiki User

15y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why does pregnancy start on the first day of your last period?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

Is the week of pregnancy considered from last period day?

Estimated due dates and pregnancy time lines are calculated from the very first day of your last menstrual period.


What is the first pregnancy trimester?

Until 13 weeks after the last period.


What is counted as the first day of a pregnancy?

It's the first day of your last menstrual period.


How long after your last Depo Lupron shot will your period start?

it should start in about 35 days, if not a pregnancy test should be administered.


How do you calculate weeks of pregnancy according to last menstruation?

You work out how long it is since the FIRST day of you last period.


How many days after periods you can identify pregnancy?

Pregnancy can be confirmed about 4 weeks after the first day of your LMP (last period) or about the time your next period is due to begin.


How far along must you be in pregnancy if the last day of your period was may 30th and today is June 26th?

What was the first day of your period? That is more important as that is when pregnancy is counted from.


When you calculate how far along you are in pregnancy do you count week one as the start of your period?

To calculate an estimated due date you should count from the very first day (the day you started bleeding) of your last menstrual period.


Do you check the start of a new cycle on the first day of your period or the last?

last


How soon pregnancy symptoms?

Pregnancy symptoms can start at any period of time for any person. It truly depends on the person. They can start as soon as conception occurs and can last until the baby is born.


Is pregnancy calculated from the day of conception or implantation?

Estimated due dates and pregnancy time lines are calculated from the first day of your last period.


Does the last two weeks before your cycle consider it as safe?

First few days of the last two weeks are considered as danger period. You are likely to get the pregnancy at this period.