Do dating scans date from conception sandra bullock and sylvester stallone dating

However, women are not textbooks and sometimes have shorter or longer cycles and/or have ovulation at slightly different times.

Therefore, knowing when fertilization and conception happen can be a bit tricky.

Health-care providers define the stage or length of pregnancy differently than many people might think. Logically, one might imagine we represent a pregnancy by how much time has elapsed since conception.

do dating scans date from conception-5

The due date may be estimated by adding 280 days ( 9 months and 7 days) to the first day of the last menstrual period (LMP). The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, and that ovulation and conception occurs on day 14 of the cycle.

Use of the LMP to establish the due date may overestimate the duration of the pregnancy, and can be subject to an error of more than 2 weeks [5-7].

Yet one question brings confusion, “How pregnant is this women? However, you can also date a pregnancy with embryological age, starting at conception.

” The related question, “When does pregnancy start? This graphic is intentionally simple, removing all the hormones and other fun stuff.

That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age.

However, the timing of the actual delivery is not so predictable.Just wanting to know if any others have had an EDD from a scan that was different to the EDD calculated based on their LMP (last menstrual period).Which was correct in the end – the LMP due date or the estimated date of the scan?Some women will deliver on their due date, others before, and others after.The body is not on a clock counting down to delivery; natural variation will introduce uncertainty.When people discuss how far along in pregnancy someone is, they tend to do so in general terms: “She’s in the first trimester” or “She’s four months along.” However, many people have only a vague idea of what those phrases really mean.

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