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An early ultrasound is the most accurate way to predict conception date.
The only thing more accurate is if you have IVF or only one possible day.
An ultrasound done between 6-10 weeks is especially accurate but anything below 12 weeks is very accurate.
After that, the baby will grow at different rates based on genetics, nutrition, etc.
But before 12 weeks, babies all grow at the same rate under normal circumstances.
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if you have sex with 2 partners 14 days apart...would it be possible to rule one out based on ultrasound dating?
If you have an ultrasound before 12 weeks, we can nail it down.
The viation of ultrasoun before 12 weeks is just a few days.
It's much harder if there are only a few days between the possible dates of conception.
14 days is plenty.
And harder later in the pregnancy.
ok so i had an ultrasound done on 2/24 that dated the pregancny at 5 weeks 5 days and another on 2/27 that dated the pregnancy at 5 weeks 2 days....that is a 6 day difference....that is pretty big right?
Let me calculate it.
So conception was somewhere aroun January 30th to February 5th range.
That is a pretty tight range
What were the 2 potential conception dates?
well there is january 14th with one person and then january 27th and 29th with the other
Ultrasounds are a little more accurate past 6 weeks because the fetus is easier to see.
The 14th is out.
january 14th used a condom one time to completion and then no condom second time but no ejaculation second time
Conception was from the sex on the 27-29
i also took the morning afterpill....does that affect ovulation?
The 14th is not the father.
If you got pregnant on the 14th, than the ultrasound would've show 8 weeks.
They would not have made an error confusing a 5+ week with an 8 week pregnancy.
The only way is if the pregnancy ended in miscarriage and the baby stopped growing.
i google way to much...so here is my question...isn't it possible for sperm to live in vagina for 7 days and then take an addition 14 days to implant?
Morning after pill can delay ovulation.
so doesnt that make it possible to the the 14th?
Yes sperm can live in the vagina for 7 days, and yes it can take up to 14 days for implantation but during those 14 days, the baby is already growing.
If you go on to have a healthy pregnancy, than it cannot be from the 14th.
If you go on to have a miscarriage, than it can be either.
should i be worried about the difference in ultrasound dates?
No, babies during the 5th week are hard to measure.
They are much easier to measure between 6-12 week.
If you can, get a repeat ultrasound in a couple of weeks.
That will settle it.
If the pregnancy is healthy, the growth will be good, the heartbeat will be clear and the measurement most accurate.
I do not think you got pregnant from the 14th if you have currently a healthy pregnancy.
Any other questions?
are hcg levels a good indication of a healthy pregnancy
If you watched them taking the measurement, you saw how small it is.
It depends alot on where they put those little white cross markers.
If they juggle their hand a little while tapping it into position, it can change the day byt a few days when they are so small.
Yes, if you get 2 hcgs 48 hours apart, than it should almost double in value.
If it doesn't clearly double, than getting a third one in another 48 hours will usually settle the question.
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so if this is a healthy pregnancy you believe there is no way it could be from the 14th?
The bhcg should be steady going up just under double each time.
yes that is correct.
is cramping this early normal?
Yes cramping is normal as the implantation takes hold.
It is normal.
Even a little spotting can be ok.
is it too early to tell if this is a healthy pregnancy?
No, this is a good time to ask for the hcgs
Get 3 of them 48 hours apart and that will give you the answer.
i had them done on 2/20 at 2846 and again 39 hours later on 2/22 and the were 4296....should i have gotten another one? and do hcg levels correlate to what can be seen on an ultrasound?
Yes one more would be helpful.
I need to do something for a few minutes, let me look at that number better in a few minjutes. It didn't quite double.
Ok, now I can concentrate again.
So the second one was drawn a bit early so the known calculations can't be run on the number.
So yes getting a thrid one even at this stage would be helpful.
No the numbers do not correlate with what is seen on the ultrasound.
should i request it from my doctor?
Yes you can.
That will be the fastest way to determine if the pregnancy is healthy.
Alternatively, repeating the ultrasound 1 week after the last one will also be able to tell.
it appeared as though there may have been a yolk sac...is that a good sign?
Yes, we like a normal yolk sac.
That decreases the risk of miscarriage.
no...thank you! but knowing me i will ask all these questions to someone else again!
Ok, that's fine, it's always get to get more opinions, but be sure to click accept so we get credit for our time and we don't mind:)
Hi Dr. Collins,
How possible is it for me to go into an ultrasound next week and have it show me two weeks further along than previously thought?
Google is my worst nightmare...and I had read that doctors have missed the "baby" when measuring not to mention an expert on here has told me that as well. I am sorry to ask so many questions...but this really does affect the rest of my life. Also, for about a week I was really not eating well...I would say less than 500 calories a day...i was still taking the prenatal vitamins though....could this have affected the growth of the baby on the utlrasound?
I had another ultrasound this morning. It showed me at 6 weeks 6 days with a heart beat that went up to 136. Would you be confident in saying that now we can be 100% sure that conception happened after the 29th of January and impossible to have happened after the Jan 14th encounter?
Thank you so much for your patience with me! You have really helped me through this pretty difficult time!
I have been doubting myself again on the paternity of the baby. I realized now that I believe my hcg levels were too high when taken to be indicative of guy number 2. On 2/20 they were 2895 and 2/22 4486 (not taken 48 hours apart) but still high for someone who wasn't really even 5 weeks along at that point correct??