Twin Loss & Pregnancy: Can a 8-Week Pregnancy Still Be Viable?

Question
CAN A FEMALE THAT IS 8 WEEKS DILATE 5 CM,BE PREGNANT WITH TWINS LOSE ONE AND STILL BE PREGNANT. WITH THE OTHER ONE, AND THE LAST ONE WOULD AN OB PERFORM A SURGERY IN WHICH THEY WOULD SEW HER UTERUS UP SO SHE CAN GO TO FULL TERM

Answer
Losing one of a set of twins is very, very common in early pregnancy.  In fact, it is estimated that as many as 70% of all pregnancies begin as twins or more.  The only reason we know about this now is because of the increasing prevalence of very early ultrasounds, which can detect these "vanishing twins" before they disappear.  The loss of a twin this early does not usually have any effect on the remaining pregnancy.

It would be unusual for a dilation of 5 cm to be mentioned in conjunction with an 8-week pregnancy.  This is because the use of cm in measuring dilation is only an estimate, and is based on the average baby's head being approximately 10 cm across.  An 8-week pregnancy would never dilate literally to 10 cm because there isn't anything that big to pass; measuring anything relative to the fetal head at that point would be equally difficult because the entire baby is only a couple of cm in length.  However, if a miscarriage or partial miscarriage (loss of a twin) was in progress, the cervix would be more open than closed, and this might be noted on examination.

A cerclage is a surgical procedure where a stitch is sewn into the cervix to help hold it shut.  This is usually performed in cases of incompetent cervix, and occasionally for higher-order multiples.  However, it is not usually done until at least 13 weeks, even with a prior history of incompetent cervix, because doctors want to make sure the pregnancy is viable first.