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They are written by UK doctors and based on research evidence, UK and European Guidelines, so you may find the language more technical than the condition leaflets.

This pregnancy due date calculator will give you a rough idea of when your baby should be born.

However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization.

In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation [26,27].

If you are part of the growing tribe of IVF moms, you can calculate your due date more precisely using your IVF transfer date.

Even if you can’t pinpoint when you conceived, forget the day of your last menstrual period or aren’t sure when ovulation occurred, other clues can help you and your practitioner determine your due date at your first prenatal appointment, including: Whether you're trying to avoid being very pregnant in the middle of summer or are a teacher who wants to maximize time off with your little one, you can try to time when you conceive in order to "plan" your due date. While it’s definitely not a reason to worry, your doctor may change your due date for a number of reasons as your pregnancy progresses.

The actual date may be any time from 38 to 42 weeks in most pregnancies.

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This is how your doctor will estimate your due date — and it’s a pretty solid target.

Doppler Ultrasonography The fetal heart can be heard using Doppler ultrasound by 10 to 12 weeks in most patients [10]. Savitz DA, Terry JW Jr, Dole N, Thorp JM Jr, Siega-Riz AM, Herring AH.

The gestational age should ,therefore, be at least 10 to 12 weeks if fetal heart tone are heard. Kramer MS, Mc Lean FH, Boyd ME, Usher RH: The validity of gestational age estimation by menstrual dating in term, preterm and postterm gestations. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination.

But even if you're one of the lucky ones who's able to get pregnant when she really wants to, just remember that you probably won't be able to map out exactly when you'll give birth to the day (or even the week or month! It may be that your periods are irregular and your early ultrasound dating was off, or that your first ultrasound was in the second trimester.

It could also be because your fundal height is abnormal, or your levels of alpha-fetoprotein (AFP), a protein made by the baby, are outside the usual range.

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