Pregnancy 18-24 Community
can a ultrasound be wrong?
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can a ultrasound be wrong?

i had a ultrasound on jun 28 2011 and it said i was 13weeks 0days, so i counted back 13 weeks and it said i conceived about march 28 or 29, but i had a period apr 7 and it lasted about 5 days(normal) for me. i took 2 hpt at the end of apr around the 25 for the first 1 and 28 the second 1 and both were neg. i got a pos test on may 3 so im very confused at this point and i still question my due date which is jan 3 2012 and according to my lmp i should be due about jan 11 or 12 that almost 10 days and my ob keep saying is ok????? but im not ok with the dates
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Avatar_f_tn
The accuracy of your ultrasound will depend on the quality of the equipment and the experience/skill of the person doing the exam.

Also, gestational age and fetal age are slightly different. Gestational age is usually based on your last menstrual period...but actual conception (and thus actual fetal age) takes place about 2 weeks or so AFTER the start of your last menstrual period. SO...if you are 13 weeks gestation, conception took place approximately 11 weeks before.

With that in mind, I get an approximate conception date of April 12...looks as though you may have ovulated early so using the LMP date to estimate due day may not work...IF the ultrasound is accurate.

You should be having another, more comprehensive ultrasound right around now. It is usually scheduled for around 18-20 weeks.
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134578_tn?1404951303
Don't count back 13 weeks from a pregnancy date given you by an ultrasound if you are trying to figure out when you conceived.  Medical dating counts back to your presumed first day of your last cycle, not to your conception date.  
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Avatar_f_tn
The accuracy of your ultrasound will depend on the quality of the equipment and the experience/skill of the person doing the exam.

Also, gestational age and fetal age are slightly different. Gestational age is usually based on your last menstrual period...but actual conception (and thus actual fetal age) takes place about 2 weeks or so AFTER the start of your last menstrual period. SO...if you are 13 weeks gestation, conception took place approximately 11 weeks before.

With that in mind, I get an approximate conception date of April 12...looks as though you may have ovulated early so using the LMP date to estimate due day may not work...IF the ultrasound is accurate.

You should be having another, more comprehensive ultrasound right around now. It is usually scheduled for around 18-20 weeks.
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Avatar_f_tn
that seems to make a little more sense to me... and thats a good reason because the ultrasound tech did indeed seem to really not know what she was doing and when i got my 2nd ultrasound aug 8 i had the same tech and it was the same issue some else had to be called in to assist her and help her as well.far as the ovulating early i kinda thought so myself so when i ask my doc she explained the its kinda unlikely do the fact my lining of the uterus having even prepared to bulid back up frm the bleeding (idk) something in that form.. i never heard that you ovulate a day or two after your period stops??
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Avatar_f_tn
You ovulate about 14 days before the start of your period. So if you ever have a short cycle (say 24 days from the first day of one period to the first day of the next and you ovulate 14 days before the start of that second period...if your period lasts 5 days you ovulated 5 days after your period ended. If you have a very short cycle it is possible to ovulate within a few days of the end of your period.

I hope this helps.
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