I dated this girl who cheated on me... she is pregnant now 27 or 28 weeks. Her last lmp was November 28, 2011... last five days. She admitted have sex with the guy November 29,30,1of dec. she had sex with me on December 11. She had an ultrasound done on February 21,2012... saying she was 12weeks pregnant. The doctor told her that she was due September 3,2012... and said her conception date is November 29,2011... she conceived on her period. Should I believe the doctor that the baby isn't mine? If she conceived on her period, isn't she off by a week or so from the ultrasound done on February 21, 2012?

The dates are too close together. The only way to know for sure who the father of this baby is, is a DNA test after the baby is born. There's no other way to determine parentage accurately.

Conception dates are give or take a week or two, never "exact" it is far to close to be for sure, without a DNA test after the child is born.

So conception dates can be off by a week or 2, making it a chance the baby is mine? Have doctors using ultrasound dating conception ever been that far off? I read on other web sites that dating conception using ultrasound at 12 weeks can only be off by a few days at most? True or false?

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Originally Posted by badley

so conception dates can be off by a week or 2, making it a chance the baby is mine? have doctors using ultrasound dating conception ever been that far off?

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Ultrasound is a guess based on the development of the baby, but yes, it can be up to 2 weeks off.

If I had gone by ultrasound my son should have been 11 pounds at birth. He was 8.

If my friend hadn't listened to an ultrasound she wouldn't have painted the baby's room pink after being told that it was 99% positive to be a girl. Her poor son wore pink for the first year of his life.

Ultrasounds aren't exact, they're an approximation. Only a DNA test can determine paternity.

Thanks for your advice... really appreciate. So can ultrasound dating conception at 12weeks be that far off early on? Other web sites says ultrasound only a week or 2 off in the second trimester and later on in pregnancy, not in the first trimester though. http://www.perinatology.com/calculators/Due-Date.htm .sorry I'm a little confuse. Plus she's already engaged to the other guy now base off the ultrasound conception date info saying conception belongs to him on nov.29 encounter.

I know this sucks. You want an answer now. You want someone to say "no chance this baby is yours". Sadly that can't be done. An ultrasound, no matter when it's done, can be off by two weeks either way. The fact that you stated that she conceived while on her period, makes things even more muddy. She can't go by her last menstrual cycle then.

I know you want answers, and you can get them, but not now. You'll have to wait until the baby is born and get a DNA test. I'm sorry, but really, a DNA test is the only answer. Everything else is just a guess.

Thanks... yeah, I guess I have to wait until sept.3

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Originally Posted by badley

thanks...yeah, i guess i have to wait until sept.3

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It's not that long to wait. I know it's hard. But it will fly by. Then you can get the DNA test, and hopefully move on with your life.

Let us know how it goes, and good luck. :)

Well I don't think a DNA test will be needed, its either the baby will be mix or not (white&black)... but yeah not that further to wait. Thanks will do.

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Originally Posted by badley

well i dont think a dna test will be need, its either the baby will be mix or not...but yeah not that further to wait. thanks will do.

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Get the DNA test anyway. It's not always easy to tell by looking at a child, whether it's mixed. In fact, I have known people that had a biracial child, even though both parents were whiter than snow. It happens.

A DNA test isn't that costly considering the peace of mind it will give you.

Good advice... I haven't talk to her in months though,(actually we have no contact at all.) she moved out of state, I don't know if she will or not with the whole DNA test... she believes without a shadow of doubt the baby is his, also I believe so too... just wanted someone else opinion about it. Well only time will tell... thanks.

Not all mixed children look mixed so "looks" never is 100 percent

That's true for mix kids... but this union, the baby will either be all white or mix with curly hair weather very light skin or dark brown skin... DNA test sounds good, but its not my call to make... I think the only way she would get one, if the baby don't have visible traits of the guy she's with.

Did you know that all, or the majority, or back and or mixed babies look white for the first few days of life?

Yes I know that the majority of babies look white until they are a few days old of life... but as I mention, the only way she would doubt the baby belong to the other guy... is if the baby didn't have traits after him... conceiving on your cycle is rare for any woman, and with a 10 to 11 day between sex partners... it just seem like it's a given that the ultrasound dating conception to her second day of cycle is right... at least that's what the doctor assured her... he was confident in his dating. Only time will tell I guess

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Originally Posted by Alty

I know this sucks. You want an answer now. You want someone to say "no chance this baby is yours". Sadly that can't be done. An ultrasound, no matter when it's done, can be off by two weeks either way. The fact that you stated that she conceived while on her period, makes things even more muddy. She can't go by her last menstrual cycle then.

I know you want answers, and you can get them, but not now. You'll have to wait until the baby is born and get a DNA test. I'm sorry, but really, a DNA test is the only answer. Everything else is just a guess.

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Sorry for all the questions, but what did you mean by being more muddy because the ultrasound dating conception on the 2nd day of her period? Why can't she go by her last menstrual cycle?

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Originally Posted by badley

sorry for all the questions, but what did you mean by being more muddy because the ultrasound dating conception on the 2nd day of her period? why can't she go by her last menstrual cycle?

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She can't go by her last period because you stated she conceived while on her period.

Most times dates are figured out by the last menstrual cycle. The majority of women are most fertile around 2 weeks after their period. If she conceived while on her period, which you really can't know for sure, then there's a 2 week window, or more, where the dates could be off.

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Originally Posted by Alty

She can't go by her last period because you stated she conceived while on her period.

Most times dates are figured out by the last menstrual cycle. The majority of women are most fertile around 2 weeks after their period. If she conceived while on her period, which you really can't know for sure, then there's a 2 week window, or more, where the dates could be off.

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Oh.. okay, so I guess the doctor had to date her pregnancy from conception and not from lmp.

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Originally Posted by badley

oh..okay, so i guess the doctor had to date her pregnancy from conception and not from lmp.

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And that's another issue. There's no way to know when she conceived, unless she's 100% sure of when she ovulated. It's all a guess.

You still seem to be grasping at straws. Really, there's no way you're going to get any answers until the baby is born and a DNA test is done.

You can go round and round with this for the next few months, and you still won't know who the father is until the DNA test comes back.