Can your scan be out as scan show 20 weeks but think it is wrong 20 weeks ago I already had missed a period had morning sickness had already tested pregnant how could I conceive that week?

Answer 1

Techniques such as ultrasound monitoring and measurement can most definitely be off by a much as several weeks. However, when you are informed that you are 20 weeks pregnant, this count begins on the date your last period ended. As there is no way to pinpoint precise times of conception, the 40-week pregnancy includes an average of two weeks prior to conception (you ovulate around halfway through your cycle and could conceive then, but the countdown begins on the day of your last period, which is why they can roughly calculate due dates by adding 9 month and 6 days to the date of your last period). So, if you believe that you were exhibiting signs such as morning sickness and a missed period and had a positive pregnancy test result 20 weeks ago, you might be around 23-24 weeks, technically (add around 1-2 weeks before you conceived and around 1-2 two before you detected a missed period and produced a positive test result). Did you know the exact date or thereabouts of the end of your last period? Perhaps you were a week or two off when your doctor asked you that question. Or perhaps your child is somewhat small for his or her age (nothing to worry about, of course, all children develop at different rates and at slighter different ages) and the fetal measurements are slightly off. Also, irregular cycles are common, meaning you may have conceived earlier than 1-2 weeks into your cycle or much later, and this too may throw off your due date and preceived progress.

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