Fetal dating calculator

Enter last menstrual period LMP , current gestational age GA , OR expected due date to determine the other two, plus estimated date of conception.

Pregnancy Due Date Calculator | Pregnancy Calculator | Mother&Baby

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Calculating Conception

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Conception date

Some women's cycles are not exactly 28 days. If your cycle is shorter or longer than 28 days, please adjust the number below. To work out the length of your menstrual cycle , count from the day your period normally starts to the day before your next period.


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  • Pregnancy Due Date Calculator!
  • The average cycle is 28 days. Your due date is calculated from the end of your last period, plus 40 weeks or days. That said, it is very likely your baby will arrive a couple of weeks either side of your due date, so it's a good idea to keep this date in mind and get prepared! So, this means when your doctor tells you you're four weeks pregnant, your baby's gestational age is actually two weeks.

    At your dating scan , otherwise known as your 12 week scan, your midwife will be able to give you a more accurate guide to your due date. You will normally have a dating scan between weeks pregnant.

    How to calculate age of fetus after positive pregnancy test? - Dr. Teena S Thomas

    Trimester means 'three months', so your pregnancy will be divided into three trimesters. Your first trimester will be from conception to thirteen weeks and six days.

    Pregnancy (Due Date) Calculator

    Your second trimester is from 14 weeks to 27 weeks and six days. Your third trimester is from 28 weeks to when you give birth. Although all babies grow at different rates, you can work out how big your baby is in terms of the fruit and veg you might recognise in the supermarket here. Have approx 60 seconds to spare?

    Pregnancy due date calculator

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