T.L.
I have never had this happen but can understand the stress and worry of a 2nd mis-hap. Because this was a rare occurance I would not think this could happen a 2nd time. Tell your Dr. that you had a previous complication (and/or C-Section) and they will be very carefull with your 2nd pregnancy. They will do many tests to ensure a healthy pregnancy. I found a little info on Babysource.com about placenta ruptures and thought I would share it.
http://www.babycenter.com/refcap/baby/physrecovery/115233...
What is a uterine rupture?
A uterine rupture is a tear in the wall of the uterus, most often at the site of a previous c-section incision. In a complete rupture, the tear goes through all layers of the uterine wall and the consequences can be dire for mother and baby. Fortunately, these ruptures are relatively rare events � exceedingly rare for women who've never had a c-section, a previous rupture, or other uterine surgery. The vast majority of uterine ruptures occur during labor, but they can also happen during pregnancy.
The first sign of a rupture is usually an abnormality in the baby's heart rate. (This is why a woman attempting a vaginal birth after cesarean, or VBAC, needs continuous fetal monitoring.) The mother may have symptoms such as abdominal pain, vaginal bleeding, a rapid pulse, and other signs of shock, and may even experience referred pain in her chest caused by irritation to the diaphragm from internal bleeding.
What causes uterine rupture?
Ninety percent of uterine ruptures happen at the site of a scar from a previous c-section. And ruptures are most likely to occur during labor because a scar is more likely to give way under the stress of contractions.
It's possible for an unscarred uterus to rupture, but that happens in fewer than 1 in 15,000 pregnancies, almost always during labor. Risk factors include having had five or more children, a placenta that's implanted too deeply into the uterine wall, an overdistended uterus (from too much amniotic fluid or carrying twins or more), contractions that are too frequent and forceful (whether spontaneous or from medication such as oxytocin or prostaglandins, or as the result of a placental abruption), and a prolonged labor with a baby that's too big for the mother's pelvis.
Trauma to the uterus, from such things as a car accident or a procedure such as an external cephalic version or a difficult forceps delivery, may also cause a uterine rupture, as can a difficult manual removal of the placenta.
Good luck to your family,
TLee