help please

Anna - posted on 02/08/2014 ( 6 moms have responded )

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I am 14 weeks and 4 days the doctors say i am 15-16 weeks, is this possible or what does this mean? Does the Ultrasound consider you pregnant from the first day of your last period

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Jodi - posted on 02/08/2014

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As I said, that is only 3 -10 days difference. There is a margin of error. Diagnostics, such as ultrasounds, calculations based on LMPs, etc, aren't an exact science. That's why, while due dates are calculated from the beginning of your LMP, your baby could be born full-term anywhere between 38 and 42 weeks.

Anna - posted on 02/08/2014

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My last period was october 30th i went to the ongyn december 27th he said i was 8 weeks and 5 days. Starting from my lmp i should be 14 weeks and 4 days but last night i went to the ER and the doctor said i was 15-16 weeks.

Jodi - posted on 02/08/2014

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But how do you know you are 14 weeks and 4 days? How did you work that out in the first place? Do you understand that you could have actually conceived anytime in your cycle. When they give you your initial due date, they base it on your LMP, and that is all. When they do an ultrasound, they work out the size of the baby (based on a number of factors), and then add 2 weeks to it, taking that back to your LMP. The fact is, you may ACTUALLY have conceived later than mid-cycle. Or your cycle may be longer than 28 days. It isn't an exact science. The difference between 14 weeks and 4 days and 15 weeks is a mere 3 days. Maybe you ovulate a little later in your cycle. Who knows?

This is why they call it an ESTIMATED due date. Only 10% of babies actually come on the calculated due date.

Jodi - posted on 02/08/2014

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Yes, when the ultrasound considers you pregnant from the first day of your last period.

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