Calculate the age of a pregnancy Posted: 10-31-06 17:21pm
My First Day of my Last Period was on July
24th, 2006. I am concerned that I might be
pregnant from a completely different
person whom I had protected sex on July
22nd, 2006. I had unprotected sex with my
now boyfriend on the weekend of the July
30th and August 6th. I have had 2
ultrasounds first one on Sept. 9th which
dated me at 5.5 weeks and second
ultrasound on Sept. 19 which dated me
7.5weeks. The baby did have a heart beat
on the first ultrasound. My due date is
May 5th. What is the probability that I am
pregnant from the sexual intercourse I had
on the 22nd of July?
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DoctorAnswer
Doctor Answer
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Pregnancy Answer A1767 Posted: 11-29-06 04:02am
If the first day of your last period was
on the 24th of July, then you can’t be
pregnant from sexual intercourse that
occured before that date. The age of a
pregnancy is calculated not from the date
of conception, but from the first day of
your last period (usually about 2 week
before conception). If you count your
pregnancy age from the first date of your
last period, your pregnancy age was about
8 weeks and 2 days on the 19th of
September. The ultrasound indicated an age
of 7.5 weeks. Obviously, there is a
difference between the age determined
according to the last menstruation and
that determined by the ultrasound. That is
because the ultrasound doesn’t count the
days but measures the embryo’s
dimensions and compares them with the
standard dimensions for an average
pregnancy. Some women don’t remember
when their last menstruation happened and
then an ultrasound examination is the only
way to assume the age of a fetus. A
difference of less than 1 week (like in
your case) is not a problem.
The embryo’s heartbeat can’t be heard
before the 7th week of pregnancy.
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