Question 1

ultrasounds in the first 4 to 6 weeks of pregnancy can only have a error of 3 to 5 days?

Accepted Answer

very accurate: If done properly the first trimester ultrasound measuring the actual embryo length  is the most accurate dating method.

Question 2

accuracy at 11wks. pregnant, going by the actual age of pregnancy can it be possible for the ulstrasound to date me 10 days before i even had sex with second partner and 1 day after my first partner?

Accepted Answer

: Evidence suggests that ultrasounds more accurately predict your due date than using your last menstrual period—but only in the first trimester and early second trimester (until roughly 20 weeks). Early ultrasound due dates have a margin of error of roughly 1.2 weeks. After 20 weeks, your Dr will measure your fundal height to see if the baby's growth is keeping on track with the EDD.

Question 3

w/my first child i had a sonogram at 8,12,16,20wks. w/current pregnancy she said the 1st would be 20wks. why the difference? can i request more?

Accepted Answer

Hard to say: The timing and frequency of sonograms is usually driven by need.Some information obtained during the initial evaluation may suggest the need for more monitoring than others. Your first pregnancy likely triggered some concerns that are not present now.More exams would not hurt baby, but may not be paid for by insurers unless they meet the "need" requirement.

Question 4

why am i so scared about my first pregnancy sonogram appointment?

Accepted Answer

You are human: It is natural to be worried about the health of your fetus. However, do not let fear disrupt your life.  Please do not fear the things which you can not control.  Be happy about your first pregnancy and let things take their natural course.  You will likely be amazed at the first time you see a sonogram picture of your baby!

Question 5

my first sonogram of 8 weeks and 2 days of pregnancy says my due date is sept.17, 2013. could i have conceived between dec.15 and dec.26 of 2012?

Accepted Answer

Around xmas: If you estimated due date on 09/17/2013 that  makes  your LMP around 12/11/2012 , usually you get pregnant about 2 weeks after your period so most likely  you conceived around xmas  12/25.

Question 6

can the first 2 ultrasounds of pregnancy taken a month apart with the same accuracy of gestational age in the second trimester be off by +- 25 days ?

Accepted Answer

Ultrasound: The earlier an ultrasound is done the more accurate it is. The due date should never be changed to the date received on a later ultrasound.

Question 7

are 3 transvaginal ultrasounds safe during first trimester? had to have one to confirm pregnancy and two for emergencies

Accepted Answer

Ultrasound safety: Ultrasound is safe in pregnancy. Ultrasound does not cause any radiation to be emitted, and there are no known harms to ultrasound in pregnancy.

Question 8

i never knew i had a fibroid until my first ultra sound for my pregnancy, the doctor told me to don't worry, i would only get some pain. is this true?

Accepted Answer

Yes,it's true!: Fibroids are very common. Many never cause symptoms or problems.  If they do, (pain, increased or abnormal bleeding) get checked. Otherwise, relax!  Is often no big deal.

Question 9

hi,  i had my first appointment today after 8 weeks of pregnancy.  ultra sound showed that no heart beat for feotus. we are planning to do d&c tomorro?

Accepted Answer

Serum P.G. test: Have you had 2 serial pregnancy tests that are declining? If not, that should be a consideration prior to emptying the uterus as sometimes the ultrasounds at 8 weeks "miss" the fetal heartbeat.

Question 10

how accurate are first trimester ultrasounds? how accurate are ultrasounds done during the first trimester of pregnancy? i had one done and the doc told me that i'm 8 weeks pregnant, but how off could he be? is there a week or 2 margin of error?

Accepted Answer

The : The earlier an ultrasound is performed during pregnancy the more accurate it is likely to be. Here's a general rule of thumb: a due date given during the first trimester should be within 1 week of the true due date; during the second trimester it is within 2 weeks; and during the third trimester it is within 3 weeks. 
An 8 week ultrasound is quite accurate and if it differs more than 1 week from your due date based on your last menstrual period, then your obstetrician will assume the ultrasound to be more accurate. In your case, if you were told that you were 8 weeks along you could have actually been between 7 weeks and 9 weeks and your due date also has a +/- 1 week range of error. You will probably have another ultrasound during your second trimester. The technologist will recalculate a due date; this will have a larger margin of error but should be within 2 weeks of the initial due date you were given (remember the rule of thumb described above). Because the earliest ultrasound is considered the most accurate, the due date given at the first ultrasound is usually not changed by the obstetrician.

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Doctor answers about:

When were ultrasounds first used for pregnancy

A member asked:

Ultrasounds in the first 4 to 6 weeks of pregnancy can only have a error of 3 to 5 days?

A member asked:

Accuracy at 11wks. pregnant, going by the actual age of pregnancy can it be possible for the ulstrasound to date me 10 days before i even had sex with second partner and 1 day after my first partner?

A member asked:

W/my first child i had a sonogram at 8,12,16,20wks. w/current pregnancy she said the 1st would be 20wks. why the difference? can i request more?

A member asked:

Why am i so scared about my first pregnancy sonogram appointment?

A member asked:

My first sonogram of 8 weeks and 2 days of pregnancy says my due date is sept.17, 2013. could i have conceived between dec.15 and dec.26 of 2012?

A member asked:

Can the first 2 ultrasounds of pregnancy taken a month apart with the same accuracy of gestational age in the second trimester be off by +- 25 days ?

A member asked:

Are 3 transvaginal ultrasounds safe during first trimester? had to have one to confirm pregnancy and two for emergencies

A member asked:

I never knew i had a fibroid until my first ultra sound for my pregnancy, the doctor told me to don't worry, i would only get some pain. is this true?

A member asked:

Hi, i had my first appointment today after 8 weeks of pregnancy. ultra sound showed that no heart beat for feotus. we are planning to do d&c tomorro?

A member asked:

How accurate are first trimester ultrasounds? how accurate are ultrasounds done during the first trimester of pregnancy? i had one done and the doc told me that i'm 8 weeks pregnant, but how off could he be? is there a week or 2 margin of error?

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