Were you told that you conceived 14 days after your LMP even though you know thats not true. My ultrasound date was a month behind this date .. even before my LMP, so when I asked him if I conceived before my period all he said is "You concieive before a missed period" Unless my u/s date was wrong but do you think if I conceived on Jan 20th (according to LMP) the u/s date would say my gestation age dated back from Dec 22nd? I was 22w5d when i had this done. I was told that all fetus' grow at the same rate until 20 wks.
2006-08-07 05:33:07 · 13 answers · asked by Etta 1 in Pregnancy & Parenting ➔ Pregnancy
Its a completely archaic method of determining date of conception and/or delivery. MANY women have an almost-normal period for the first month of their pregnancy, so their LMP is clearly inaccurate at this point. I would strongly suggest talking to your OB/GYN and urging the use of the data obtained from your ultrasound readings. THEY are far more accurate these days than LMP guess-timations!
2006-08-07 05:38:52 · answer #1 · answered by Brutally Honest 7 · 0⤊ 0⤋
I know exactly what you're talking about! I went through the same thing!
If you are sure beyond a doubt that you didn't conceive 14 days after your LMP, there are a couple of options which could explain it. However, an ultrasound is the most accurate measure of your baby's age. (They take cranial measurements to determine how old he is.) Anything else really is just a shot in the dark.
With that said, even the cranial measurement is just a very good guess. All fetuses do not grow at the same rate until 20 weeks. They grow at approximately the same rate. If your baby was a tad larger than the average baby, chances are that is what accounts for the discrepancy in date.
Keep in mind, since the due date is just an estimate, and since they really don't know exactly and precisely how old your child is to the day, your actual due date may be a little farther behind than your doctor has predicted. Be prepared for the baby to come a week or two late, provided they're wrong. Most likely, though, a week or two is the only difference between your doctor's guesses and reality.
The most accurate way to judge gestational age is to count back by weeks from your due date. They put your due date in the 40th or occasionally 41st week of pregnancy. If you ask your doctor which, then you count back, it will give you a very accurate idea of when they began counting to get gestational age.
Congratulations and good luck!
2006-08-07 13:11:17 · answer #2 · answered by Michelle K 3 · 0⤊ 0⤋
Many people get confused about this.
Gestational age INCLUDES the 14 days betwen the first day of your last period and the day of ovulation/conception.
So, if you are told your baby is 6 weeks, it really only exsisted for 4 weeks. But because women can usually track their periods, that is what is used. Ask most women when they ovulated and they will reply, "huh?"
In other words: A full term pregnancy is 40 weeks, which equals a 38 week old fetus and two weeks to account for the day you ovulated and the first day of your last period.
That info, combined with the accuracy of ultrasound for dating (approx +/- 4 days at 5 weeks and +/- 1.4 (10 days) in second trimester MAY account for the discrepency.
Your menstrual history should be considered. Are your periods regular or irregular? Do they occur every 28 days? Is the day you THINK you conceived the only episode of intercourse for the month?
If you are a month behind a SURE conception date, you may want to ask your doctor about getting another ultrasound in a month to check growth. This way you will know if your baby is too small or if your dates or off. If the baby grows 4 weeks in 4 weeks time, and the composite gestational age agrees with the earlier ultrasound, the earlier ultrasound should probably be used for your EDD. If the baby grows only 2 weeks in size during the 4 week time period, then there is probably a problem with growth and the dates may be off because of early intrauterine growth restriction (IUGR). If the growth is inappropriate Umbilcal artery Dopplers should be performed and the pregancy monitored closely.
2006-08-11 00:42:34 · answer #3 · answered by Yinzer from Sixburgh 7 · 0⤊ 0⤋
Too many details! The point is this: A woman can get pregnant ANY time of the month! There aren't any safe days! I got pregnant just 2 days before my period was due. The conception date they gave me and the REAL conception date were almost 2 weeks off! My husband wasn't even around at the time they said I got preg. Anyway, I ended up miscarrying, but the point is that you can't always go by what they say. It's only an 'estimate'. Ovulation ususally occurs about 2 weeks after the first day of a period, but our cycles can be irregular. Our bodies aren't regular like a machine.
2006-08-07 12:41:09 · answer #4 · answered by Pregnant lady 2 · 0⤊ 0⤋
I believe ovulation occurs 10-14 days after the start of your LMP, and that is why they use that as the date of conception.
2006-08-07 12:39:23 · answer #5 · answered by littlestory 3 · 0⤊ 0⤋
Wouldn't it be before your LMP.
And technically, I don't think you really have an embryo until something like 48-74 hours after the actually act.
2006-08-07 12:38:00 · answer #6 · answered by mayyouponderthis 2 · 0⤊ 0⤋
My doc says whatever date + give or take 5 days.
2006-08-07 13:26:26 · answer #7 · answered by gypsy g 7 · 0⤊ 0⤋
Never heard this before and have 2 kids.
2006-08-07 12:38:41 · answer #8 · answered by kksay 5 · 0⤊ 0⤋
Blah, blah, blah, really who cares? Just have the blasted kid and quit being so wrapped up in when you conceived!
2006-08-07 12:38:28 · answer #9 · answered by Anonymous · 0⤊ 0⤋
try counting 20 weeks back from ur u/s. i had to do that. i thought i got pg in dec but it was in nov
2006-08-07 12:40:05 · answer #10 · answered by ? 3 · 0⤊ 0⤋