I am terribly sorry for your loss. The shock of learning that you have lost a pregnancy without any symptoms is extremely difficult, and I hope that you are finding the support that you need.
Most miscarriages occur during the first trimester. After having a normal ultrasound at 8 to 9 weeks, 2 to 3 percent of pregnancies are lost and of these most are lost within the next 2 months. After 16 weeks, only 1 percent of pregnancies are lost.
There are many possible reasons for a miscarriage, but most often the cause cannot be identified. During the first trimester, the most common cause of miscarriage is a chromosome problem, and you indicated that you are waiting for results from the chromosome analysis. Other causes for miscarriage include a problem with the implantation into the uterus, maternal trauma, exposure to toxic substances, maternal health problems, or hormonal problems. Uterine problems and genetic and acquired clotting disorders have been associated with second trimester losses. It is important to talk with your doctor about what s/he thinks may have happened. Your physician is also aware of your past gynecological and pregnancy history and may recommend any additional testing based on that.
As you cope with this experience, it may be helpful to contact the National Share office at (800) 821-6819 or to review their website. This is a group that is dedicated to providing to support to those who have experienced pregnancy or infant loss.