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Nine Day Lag b/w LMP date and U/S date--problem?

1017 Views 10 Replies 9 Participants Last post by  mamaroni
This is for a good friend of mine who is totally distraught at the moment.

Facts: first day of LMP Aug 12; ovulation Aug 27-28. She is pregnant. She had an U/S today, and the tech noted the h/b, and said baby is measuring 6 weeks, not 7 (she'd be 7 according to LMP charts). Tech said, no big deal, everything looks great. Then, she goes in to talk to the OB, who is "concerned" about the 9 day lag between edd based on LMP and U/S. He wants her to come back next Friday (9 days) to have another U/S and check growth. He told her that if the baby doesn't grow, she will probably miscarry.

OH MY GOD!! I am so sad (and upset) for her. Why did they even do an U/S at 6 weeks (and this isn't her first)?? Why is the OB so hung up on the edd charts?? Why would he want her to have another U/S?? Isn't seeing a good yolk sac and h/b a GREAT indication of a viable pregnancy??

I told her not to have another U/S, and that she would have been better off not even having this one. She does agree. I mean, having the U/S isn't going to change the outcome, and SHE IS PREG!! That is the important thing. But now she is having a hard time not focusing on the negative.

Has anyone else had this issue or something similar? She wants to hear that it's happened to others who ended up with beautiful babes.

Thanks for listening!
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US are just not 100% reliable. Often they bring worry and anxiety to the forefront of pregnancies. This is what I know (uh, and why am I get an US again!?!?!).

This is how I see this situation:
1. I'm so sorry your friend is going through this. It just bites.
2. It is very much possible to ovulate later or earlier than day 14 of a cycle. So, it's possible that she ovulated early or later. Was she taking temps to confirm ovulation or just thinking she'd O around day 14 and then bleed or have positive test at 28 days? It is possible she's 6 weeks pregnant.
3. The US could be off. They're not perfect as we all know. They make mistakes. The good thing it saw a healthy baby. That's the most important thing. Dates, schmates!
4. The baby could just be waiting for a growth spurt growing at its own rate.
5. I can't believe her Dr. would be so dramatic -- "You're a week off, but your baby looks healthy. Go home and worry about miscarring for 9 days," is pretty much what he said. I'd look for another Dr with a bedside manner and ability to think outside of the US.
6. Getting another US has pros and cons. I hope your friend can just shake off her bad experience and not get another one. If she's going to take her Dr's message of miscarring to heart, then she might feel better about going back in. Hopefully she can just trust her baby's beating heart to guide her.

Best wishes! I trust your friend will have a healthy happy 9 months that results in a plump little baby that flips off the Dr. on delivery day...actually I hope that Dr. is left in the dust around month 2.
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First of all, dating the pregnancy with U/S is only accurate within a specific window.

Second, is she sure of the dates of ovulation/conception? Not all women have the same cycle.

Third, her doc is overmanaging and she should probably find a new one. Most don't even bother with an appt until like 10 or 12 weeks, or an ultrasound until around 18 weeks when it can actually tell something useful (like confirming gestational age). Even then it's not routinely necessary.

Does she have a history of miscarriage or some such that justifies the excessive managing the OB is doing? She should really get a second opinion, or better yet just fire this OB and take her time (at least a month) choosing a new one.
I should have mentioned this in the original post--she did have some fertility problems and was on clomid, which apparently does make one "high risk." Also the OB practice does have midwives, and she had planned to switch, but couldn't for this appointment. Hopefully that will help.

she is sure of her ovu dates--she watched it very closely due to her fertility problems and also used a kit.
I wanted to make a quick point in reference to this post. When you get an ultrasound at a really, really early time, like six weeks, the technician measures the baby on the screen with basically a line drawing tool like you'd find in a computer drawing program. If they are just the tinniest bit off (probably the difference between 25 and 27 millimeters or so at this point, a super tiny difference) the "age" of the embryo will be off as well, because the age is just a direct corelation with the size. So most likely, if the sac and heartbeat are there and looking good, it could easily have been a technicians goof. I would just try to reassure her as much as possible, and as for getting the next u/s it's totally whether it would ease her mind or not. Most likely the baby's going to be fine, and the next u/s would verify that...

Give her a big hug!! If she's been on fertility treatments and a long road to conceive, it's difficult to put her pregnancy in doubt, and that Dr. should be ashamed of himself!!

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I am so sorry your friend has to go thru this agoney. She probably has absolutley nothing to worry about but try telling that to someone who has had fertility issues.

I second what Jester said

Give her a big hug!! If she's been on fertility treatments and a long road to conceive, it's difficult to put her pregnancy in doubt, and that Dr. should be ashamed of himself!!
You know, at this point I'd just support whatever decision she makes. U/S's drive me up the wall when they lead to these situations, I think doctors just don't realize the impact their 'sentence' makes on expectant mama's. But, if she continues to worry about it and says another u/s would put her at ease, I'd just give her 100% support.
I didn't think they could be that accurate with such an early u/s, either. I thought that was what the 18-20 week scan was for.
Wish her good luck.
This sort of dr. makes my skin crawl.

A friend of mine had the same situation. At 8 wks her dr. ordered
an u/s. He said the baby was small, she would probably miscarry, so let's just go ahead and do a d and c. My friend told him that since there was a heartbeat, she was not getting a d and c. Her baby was born perfectly healthy (caught by another DR.)

My friend's SIL was told the same thing after an early u/s, trusted the DR (first preg) and had the d and c.

In my opinion,some Dr.s treating high risk patients may be so worried (paranoid) about a poor outcome and litigation that they believe they must terminate pregnancies that don't meet perfect "textbook" criteria.

I had an emergency u/s at nine weeks with my last pregnancy (possible ectopic) and was told baby was a week younger than dates. I was sure of the dates but told I must be wrong.
Healthy baby was born at home in the water VBAC at 42 weeks 1 day according to dates and 41 weeks 1 day according to u/s.

Hugs to your friend. I would find another caregiver.
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Ultrasound is notoriously inaccurate at detecting the size of the baby. So it is certainly possible that this whole thing is just being blown out of proportion. I too wonder why an ultrasound at this early in the pregnancy. What did her doctor hope to gain?

I can tell you what I have told other clients in the past when faced with possible miscarriage. Suggest to your friend that she talk to her baby and tell her how much she is loved and wanted.I know that baby's body isn't capable of hearing yet but her soul is. If nothing else it is good therapy for mom instead of holding it all in trying to be strong.

She could start drinking red raspberry leaf tea as well. This is a uterine tonic that will help regardless of the outcome. I will post the details below. I wish you and your friend the best.



Brewed as a tea or as an infusion, raspberry is the best known, most widely used, and safest of all uterine and pregnancy tonic herbs. It contains fragrine,
an alkaloid which gives tone to the muscles of the pelvic region, including the uterus itself.

Most of the benefits ascribed to regular use of Raspberry tea through pregnancy are traced to the nourishing source of vitamins and minerals found in this plant and to the strengthening power of fragrine - an alkaloid which gives tone to
the muscles of the pelvic region, including the uterus itself. Of special note are the rich concentration of vitamin C, the presence of vitamin E and the easily assimilated calcium and iron. Raspberry leaves also contain vitamins A and B complex and many minerals, including phosphorous and potassium.

The benefits of drinking a raspberry leaf brew before and throughout pregnancy include:

~ Increasing fertility in both men and women. Raspberry leaf is an excellent
fertility herb when combined with Red Clover.

~ Preventing miscarriage and hemorrhage. Raspberry leaf tones the uterus
and helps prevent miscarriage and postpartum hemorrhage from a relaxed
or atonic uterus.

~ Easing of morning sickness. Many attest to raspberry leaves' gentle relief
of nausea and stomach distress throughout pregnancy.

~ Reducing pain during labor and after birth. By toning the muscles used
during labor and delivery, Raspberry leaf eliminates many of the reasons for
a painful delivery and prolonged recovery. It does not, however, counter the pain of pelvic dilation.

~ Assisting in the production of plentiful breast milk. The high mineral content of Raspberry leaf assist in milk production, but its astringency may counter
that for some women.

~ Providing a safe and speedy pariuntion. Raspberry leaf works to encourage the uterus to let go and function without tension. It does not strengthen
contractions, but does allow the contracting uterus to work more effectively
and so may make the birth easier and faster.

This information is taken from:

Herbal Allies for Pregnancy Problems
By Susun Weed
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From what my OB told me with ds and my MW told me this time...those early u/s can be off by up to 2 weeks... With ds I know they were 2 weeks off on my edd and this babe they are about 5 days off (I was charting so I know when I O'ed).

I agree with some of the others...give her a hug and support what happens... u/s techs have been wrong before! I never quite understood the whole measuring sysem anyway. At my 20 week u/s the tech said it was impossible to estimate size at this point because it was so inaccurate... some of baby's measurements were 18w 2d and others were 22w 5d...and I was 20w 3d!
Thanks everyone for your thoughtful responses. My friend is doing much better today, and she and her husband have decided to ditch that OB, and go with a midwife (yeah!).

I sent her the link to this thread, and I think it helped a lot, so thanks again!
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