by Peg Plumbo, CNM (see more from this expert)
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Trying to Conceive: Are You Ahead of the Game?
Age matters. One reason for the increased incidence of multiple births in the United States is the trend toward delaying pregnancy. The incidence of twins increases for women over the age of 35 and even more if you are over 50. To put it in perspective, your chance of giving birth
The odds of twins increase with the use of assisted reproductive technology. Both ovulation-inducing drugs (infertility treatment) and in-vitro fertilization increase the odds of having twins. Between 1973 and 1990, twin births increased at twice the rate of singletons, and triplet and higher order births increased at seven times the rate of singletons. (Obstetrics and Gynecology 1994; 84:101-6)
Twins may run in your family. Even before diagnosis of pregnancy, you may suspect that you are at an increased risk of conceiving twins. Fraternal (dizygotic) twins may run in the family, and, contrary to popular belief, they do not necessarily skip a generation. If your mother or grandmother had twins, you may be carrying a gene that causes you to release more than one egg at a time, making it more likely that you will have twins.
9 Signs You May Be Pregnant with Twins
1. You just feel you're carrying more than one
baby. Don't disregard intuition or dreams. Some
mothers of twins (or higher order multiples) say that they knew
right from the start that they were carrying more than one
baby.
2. You experience more nausea and/or morning
sickness. If you are having more than one baby, you may
also have an elevated hCG level. Higher levels of hCG also make it
more likely that you will have bouts of morning (or all-day)
sickness.
3. Other normal pregnancy symptoms may be
exaggerated. Many women -- but not all -- who are pregnant
with twins have more intense pregnancy symptoms, likely due to the
extra hormones circulating through their system. You may find that
your breasts are very tender, you have to urinate frequently, you
are hungry all the time and you are very tired. In the second
trimester, you may experience difficulty catching your breath,
swelling (edema) of the hands and legs, an unusual rate of weight
gain and abdominal enlargement and excessive fetal movement. Anemia
or low iron (decreased hemoglobin) is also common with twin and
multiple pregnancies.
4. You gain weight rapidly in your first
trimester. A higher than average weight gain in the first
trimester may be your first clue that you're carrying more than
one baby. If you're eating well, don't be concerned: A
study in the American Journal of Obstetrics and Gynecology
stressed the importance of early weight gain for twin pregnancies,
since weight gain in the first two trimesters was found to have the
greatest impact on birth weight. (American Journal of
Obstetrics and Gynecology
1998;179:1155-1161)
5. You measure large for gestational age. At
your first exam you may be told that your uterus is "large for
dates." If your last menstrual period indicates an
eight-week gestation, your uterus may feel more like 10 to 12
weeks. This may prompt your care provider to request an ultrasound.
As your pregnancy progresses, if you are carrying more than one
baby, your fundal height (uterine measurement) will consistently
measure large for gestational age. A term uterus, with one baby,
may reach 38 to 40 centimeters in height, measured from the pubic
bone, while a term twin pregnancy may exceed 48 centimeters.
6. You are told that you have elevated levels of
AFP. Levels of alpha fetoprotein (AFP), a protein released
by the baby as it grows and found in the mother's blood, can be
elevated when there is more than one baby. (It can also be elevated
for other reasons, such as neural tube defects.) Normally this
simple blood test is given 16 to 18 weeks after your last menstrual
period. Alpha fetoprotein testing detects over half of all twin
pregnancies.
7. You are told you have rapidly rising hCG
levels. Human Chorionic Gonadotrophin (hCG) is a hormone
produced by the fertilized egg and by the chorionic villi. It is
needed to maintain the pregnancy until the placenta develops. It
can be detected in your blood or urine even before you miss a
period. Normally in a singleton pregnancy, blood (serum)
concentrations of hCG rise rapidly during the first weeks, doubling
every two to three days. Levels of hCG can be even higher with twin
or multiple pregnancies.
8. Your provider hears two fetal heartbeats. Two
separate heartbeats can be distinguishable with a Doppler in your
care provider's office by around 12 weeks. At around 28 weeks,
it may be possible to differentiate two fetal heads and multiple
small parts when doing an abdominal exam.
9. You have a positive ultrasound. If you believe
you are indeed pregnant with twins, an ultrasound can be performed quite
early in pregnancy. With a skilled ultrasonographer, two
gestational sacs, two embryos and two distinct fetal heartbeats can
be seen six weeks after the first day of the last menstrual period.
Many twins have been diagnosed as early as five weeks -- when
you're just one week late for your menstrual period.
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