Can It Cause Complications?
Fibroids usually develop prior to pregnancy, though many women don't know they have one until they have an ultrasound or the fibroid is discovered during a pelvic exam. If you know prior to pregnancy that you have fibroids, ask your doctor whether their size or position could cause problems, and which symptoms to watch for.
Most women who have one or more of these noncancerous growths experience no pregnancy complications because of them. For the 10 to 30 percent of pregnant women with fibroids who do end up having complications, the most common is abdominal pain, which occasionally may be accompanied by light vaginal bleeding. The baby is rarely affected unless the bleeding is substantial.
Even if you do experience symptoms, they most likely won't affect the baby. However, your risk of miscarriage and premature delivery does increase slightly if you have fibroids. They occasionally cause the baby to be in an abnormal position for delivery. They can also stall labor, or, if they're located in or near the cervical opening, they may block the baby's passage. All of these (rather rare) problems can increase the likelihood of cesarean delivery.