Pregnancy age & paternity Posted: 12-30-06 13:26pm
I am 11 weeks and one day pregnant and i
have had two scans already, one at 7wks as
i had a lot of bleeding. The problem is i
had sex with some one on the 14th oct
(very early hours of the morning, 5am) and
then my actualy bf the following friday
21st, early hours. My period was on the
26th sept, and my cycles 34 days at the
most. Who would the father most likely be?
When i was told i was 7 weeks after they
had measured it at the scan i dated back 7
weeks and it took me back to a few days
before i ovulated and exaclty 7weeks since
(to the day) i had slept with my ex but i
just dont know if that wud make him the
dad. So confused. Please help. Im 11 weeks
and one day and when i count back it takes
me to the 13th oct. Also, about 11 days
after i had sex with my ex and 3 days
after i had selpt with my bf i started to
bleed. Wud that have been implantation
bleeding making my ex most likely the
father?
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DoctorAnswer
Doctor Answer
Joined: 19 Dec 2005 Posts: 16777211
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Pregnancy Answer A2101 Posted: 01-10-07 03:29am
The age of a pregnancy is counted from the
first day of your last menstruation. If
your last period started on September
26th, you should be about 13 weeks and 5
days pregnant on the 30th of December. The
other option is that your last
menstruation was not on the 26th of
September, but on the 24th of October (the
bleeding you experienced 3 days after
sleeping with your boyfriend). If we
conjecture that October 24th was the
beginning of the last menstruation, then
you would be 9 weeks and 5 days pregnant
on the 30th of December.
An ultrasound scan does not calculate a
pregnancy age according to the calendar
(and thereby the last menstruation
date)... but according to the embryo’s
dimensions. Using an ultrasound, the
embryo's dimensions are compared with
statistically standard values and an
approximate age is assigned. There is
usually a difference between a pregnancy
age calculated by the ultrasound apparatus
and that calculated using the calendar.
Your ultrasound result (11 weeks and 1
day) is closer to 9weeks and 5days than to
13weeks and 5days. That’s why it seems
more likely that your last menstruation
was on the 24th of October rather than on
the 26th of September. Therefore, we can
guess that you probably conceived in the
first half of November.
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