Periods and Conception

Is an ultrasound EDD accurate if your period does not last normally seven days?


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2015-07-16 18:06:23
2015-07-16 18:06:23

the EDD is the estimated date of delivery, with both of my children the edd was not correct. my first was born a week after the edd which was the date of conception plus 40 weeks. my second was born 10 days prior to the edd but i also had 4 different edd.

Estimated Date of Delivery is just that, Estimated. A baby can be born from 3 weeks before up to 2 weeks after with no problems.

With my first, his scan EDD was 10 days later than my period EDD and he was born on the scan EDD.

Second time around (twins) the scan and period EDD were the same but I was induced 4 weeks before with pre-eclampsia.

The only EDD that is accurate from an ultrasound is one done in the first trimester. The earlier the ultrasound is performed, the better. We measure what is known as the crown-rump length (the measurement from the top of the head to the baby's backside), and this measurement is the most accurate in predicting an EDD. First trimester ultrasounds are typically accurate within a week of how far along a baby actually is. Second trimester ultrasounds are up to two weeks off; and third trimester ones are up to three weeks off. What we are measuring, though, is how far along the baby really is--not when the baby will be born. As someone else mentioned, a due date is only an estimate--and only 5% of women actually deliver on their due date.


Dr. B.

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Related Questions

ultrasound is more accurate. Measurments of the fetus are made during ultasound that give a more accurate gestational age

Taking a pregnancy test seven days before a missed period won't be accurate.

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Not really. Babies grow at pretty precise rates and therefore conception is pretty easy to answer at this early in your pregnancy. You are more likely to have your dates mixed up or that you conceived at a different time than you thought. Yes the date could be off a bit but ultrasound dates are usually pretty clear and accurate on dating embryos. Its all down to the measurements taken of the embryo and last period etc, that give a estimate of the conception date. When an ultrasound shows you are 7 weeks pregnant it actually means you are 5 weeks from conception. Pregnancy is on average 40 weeks from the start of the last period. This is because in the days before ultrasound this was the only date we knew. You don't actually conceive until 2 weeks after this date.

first week, no period. seven days. second week, no period. seven days. third week, no period. seven days. fourth week, period. seven days. it can vary...

A workweek is part of the seven-day period in which work is normally performed usually from Monday to Friday from 9 A.M. to 5 P.M.

When the doctor counts you as 7 weeks, they are counting from your last period. I figured if the ultrasound says 7 weeks, that is from around sep. 7th, the 1st day of your last period. meaning between sep. 18th thru sep. 24th could have got you pregnant. Likely the 21st. However an ultrasound of 7 weeks on 25th October gives you a due date of 13th June not the 3rd. See the Related Link for "conception-calculator" to the right for more.

I'm not in the medical field, but with my pregnancy at 6w 2d the technician could see the sac, but no baby. She then did an internal ultrasound, and it was then visible with a heartbeat.

well, i seen the flicker on a monitor, which is the baby's heartbeat..and I'm seven weeks.

At the first ultrasound, there were seven but shortly after the seventh stopped developing and there were six.

Seven Days after Ovulation period Seven Days after Ovulation period

For the seven days you supposed to take the sugar pills. Sometimes maybe a day or two after.

In early pregnancy (about five to seven weeks), ultrasound may determine the size of the fetus to confirm the suspected due date, detect multiple fetuses, or confirm that the fetus is alive (viable).

they normally consist of 5 but if you want they say a seven piece is called a tangram.

Nothing happens seven years after a girl has her period. There's nothing specific about this length of time.

Yes if after your period but if seven days before your period you will not become pregnant...

It is VERY rare to get a period at 7 but it could happen.

Additional Information: After three or four days of this, the bleeding ended but I still have the very bad pain. My period normally lasts a full seven days, so I really don't believe it to be that.pregnancy or miscarriage

no your period can be anywhere from 2 to seven days

That is the correct spelling of the number 57, but in US English, it is normally hyphenated fifty-seven as an adjective.

Different Types of 7 wonders. Be more accurate.

Sometimes this does occur for a unknown reason. However you do need to see your Doctor to find out what's going on.

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