How to Calculate the Stage of Your Pregnancy

Put pen to paper
If you know your menstrual cycle then you can work out your baby's due date. A normal pregnancy lasts 38 weeks from the day of conception. However, knowing the exact moment the sperm met the egg is difficult so it is worked out by counting from 40 weeks after the first day of your last menstrual period, assuming that women have 28-day cycles and that conception took place on the 14th day. As you can imagine, this is all very approximate, particularly as a baby is considered full term at 37 weeks.

Pregnancy calculator
Using a pregnancy calculator is a quick and easy way of working out your due date. Simply find a pregnancy calculator online, type in the exact date of your last period, click a button and it will work out the most likely date your baby will arrive. Then you can plan the rest of your pregnancy, using the wealth of month-by-month advice also available online.
Scan
Mums-to-be are offered a dating scan from between ten and 14 weeks of pregnancy. During this, the sonographer carrying out the scan will work out how pregnant you are by looking at your baby on the screen but even then it can be off by a week or more depending on the abilities and accuracy of the technician and the size of the baby.Most babies grow at the same rate in the first 12 weeks but the size corresponds less and less as the pregnancy continues so further scans can become even more inaccurate.




ref : http://www.articlesbase.com/pregnancy-articles/how-to-calculate-the-stage-of-your-pregnancy-6670637.html


















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