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Radioactive decay is a natural process and comes from the atomic nucleus becoming unstable and releasing bits and pieces.
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Ultrasounds and dating pregnancy

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If you have an irregular cycle, or if you've recently been taking the contraceptive pill, working out the date from your LMP isn't a very accurate method.

ultrasounds and dating pregnancy-77

The transvaginal ultrasound probe is thin, about 2cm diameter.

Most often used during the early stages of pregnancy.

Standard Ultrasound – Traditional ultrasound exam which uses a transducer over the abdomen to generate 2-D images of the developing fetus .

Any calculation of a conception date is an estimate, even in a woman with regular 28-day menstrual cycles.

Except for in-vitro fertilization (IVF) and other assisted reproductive procedures, you cannot precisely calculate the exact day a sperm meets an egg and fertilization (conception) occurs.