A member asked:

How can conception by trans u/s be est accurately if it is assumed you have a 28 day cycle & is possible to get prgnt in the first 2 weeks of gest age?

4 doctors weighed in across 2 answers

Make life simpler...: Make life simpler by staying happy and healthy, avoiding excesses (like junk food, cigarettes, alcohol), and letting nature take care of the pregnancy. Ask a trusted doctor for an estimated due date, and then think no more. Enjoy life. (it's a game of numbers: if dating by u/s, use that conception date and add 38 weeks to get the due date; if using lmp, one must adjust for cycles <28d or >28d.).

Answered 10/24/2017

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Dr. Gregory Hines answered

Specializes in Family Medicine

Ultrasound: The length of your cycle is less important when it comes to an early ultrasound, which is dating your pregnancy based on the size of the fetus, irrespective of the exact day you conceived. It is highly accurate in the first trimester to determine how far along you are, as well as when you are likely to deliver.

Answered 1/1/2013

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