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Date of concetion & paternity

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DoctorQuestion
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Joined: 19 Dec 2005
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Date of concetion & paternity
Posted: 12-31-06 20:59pm

Hi,
The first day of my last period was Nov. 20. Today I found out I was pregnant. My cycle for the past 8 months have been very irreg. ranging from 40-63 days. I am trying to find out what was the conception date. In the beginning and end of Dec I had sex with my boyfriend (no protection all times) but on Dec 16 I slept with someone else. He only went a little in me and I took the morning after pill the next morning. There is no way that this could be the other guys baby right. This is my boyfriends baby right? I just need your help to make this a less stressful pregnancy.
Thank you


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Kia

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Joined: 23 Jun 2004
Posts: 6594
Location: Planet Tampaxia,

Posted: 12-31-06 21:47pm

It is impossible to say.
It doesn't matter if he "went in you" or not.
The penis is naturally lubricating and because of how this fluid is produced it very commonly contains some sperm. This is enough to get you pregnant if you are fertile at that time.

As your periods are very irregular it is impossible to predict when you were likely to have ovulated.

If you have got a positive result on a home pregnancy test you are most likely at least 10-14 days past ovulation.
And as ovulation is typically around 14 days before your period is due, the chances are you conceived sometime around mid december.

You need to book an appointment with your doctor to arrange a booking scan and to discuss your options.

The only way you are going to know for sure who the father is is to have a paternity test done after the baby is born.
Both the poential fathers will need to give a dna sample for comparision.
It is possible to have the paternity test done earlier with an amniotic test, again both potential fathers will need to give an dna sample, and this process also carries an increased risk of miscarriage.
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DoctorAnswer
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Pregnancy Answer A2118
Posted: 01-15-07 04:23am

If your menstrual cycle is irregular, it is fairly impossible to determine the day of ovulation and estimate the date when conception occurred. If the second sexual partner ejaculated in you, the distance or amount of vaginal penetration becomes irrelevant. It seems that in this case, only DNA-tests can detect the real father.


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