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Conception date

My girlfriend cheated on me and had sex with her ex once last Dec. 27, 2013. She has irregular menstruation and we thought that she could never be pregnant. We had sex on Jan. 1, 2014 and has been doing it since then.  Last Feb. 19, 2014 we learned that she was pregnant. In her ultrasound on the 20th, it was six weeks old. Am I the father of the child?
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Avatar universal
thanks a lot. =) it really made me a lot feel better. I really appreciate this.
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134578 tn?1693250592
COMMUNITY LEADER
Hi, Eden.

If the six weeks (you have not yet told me whether it was 6 weeks 0 days or 6 weeks 3 days or 6 weeks 5 days or what, and in order to answer you precisely, it would help if you had) was labelled as gestational age, this means that as of the day of the ultrasound, she conceived about 4 weeks ago.  In other words, gestational age (or GA) does not count from the day of conception, it counts from two weeks earlier than the day of conception (on the assumption that a woman would have had a period 2 weeks prior to getting pregnant).  This would mean that if the doctor said her GA was 6 weeks (+ some number of days) on February 20, she would have conceived only 4 weeks (+ same number of days) ago on February 20.  Thus, somewhere around the week of the 20th of January.  If you had told me the number of days along with the 6 weeks, I could be more specific.  Anyway, nothing to do with the guy in December, if she did not have sex with him in January.  

The reason this is so is that gestational age does not measure back to the day the doctor thinks conception occurred.  Doctors do not use a pregnancy count that begins on that day, because conception is hidden and mysterious in its timing (until the ultrasound clarifies things).  This is a traditional way of counting pregnancy, and is still used despite the existence of ultrasounds.  They begin the pregnancy count on the day they assume was the first day of the woman's last period.  (When a woman has irregular periods, they simply extrapolate where the period would have been if she did not have irregular periods, once they see and measure the baby on the ultrasound.)  The doctor is not saying she had a fertilized embryo in her womb two weeks earlier, but that is the allowance all medical measurement of pregnancy uses.

Anyway, don't worry, it is not possible for the event December 27 to have gotten her pregnant.
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Avatar universal
the count that the doctor gave.. 6 weeks was labeled as gestational age(based on ultrasound because the last time my girlfriend had her period was wayback june 2013). Is it almost exact age? Based on our calculations... the most probable that the baby was concieved was around the 2nd week of january. Am I correct on that?

So what happened to them last December 27 did not brought forth the child her womb right? I just want to make sure that it's my child.

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134578 tn?1693250592
COMMUNITY LEADER
You are worried that having sex with someone in October and November of 2012 produced a baby that was born in December of 2013?  
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Avatar universal
Hi ,I Found Out I Was Pregnant 4/15/13 . I have irregular periods and im not sure who is the father .Ive had sex 10/29/12 -11/4/12 then round april I was with someone else .im not sure at all and my due date was December 25 , 2013 . The information I got was I ovalated 4/3/2013 and last menstrual estimate 3/20/13 . Then ,conception 3/30/2013-4/7/2013 '. Idk what to do .my baby is now 3 months
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134578 tn?1693250592
COMMUNITY LEADER
It doesn't sound like she got pregnant in December, but in January.  Please clarify some information:

-  Did the doctor say the exact words "You are at 6 weeks 0 days"?  Or did the doctor say 6 weeks and some number of days, like 6 weeks 3 days or 6 weeks 5 days?  

-  Had you discussed with the doctor that you needed to know a conception date, using the word "conception" specifically?  This matters.  Doctors do not usually begin the pregnancy count on the day they think conception was, they start the count on the first day of the woman's last period.  (No, they don't think she was pregnant then, she was having a period.  But they begin the count on the first day of bleeding of the last period she had, because that is a clear signal.)  If the doctor just said a number of weeks and didn't know there was any question about conception, he or she would NOT have been saying "the baby is 6 weeks old."  He or she would have been saying the time from the first day of her last period to now is 6 weeks.  That's called a gestational count.  

So -- how did the doctor get to the date of 6 weeks? and was it 6 weeks and some days or 6 weeks 0 days?  Did she get an ultrasound?  Or did the doctor just begin his or her computations with the first day of her last period?  And did the doctor know you two were wanting to figure out about conception?
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Avatar universal
honestly i have been confused about it. I just want to make that what happened to them last December didn't brought that baby
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Avatar universal
Most likely
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Avatar universal
Dang bro I'm in the same situation as you.
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