Uterine fibroids (or growths in your uterus) are actually the most common growth in a woman's pelvis, and usually won't cause problems during pregnancy. But if you've been having symptoms like pain or discomfort, you should definitely talk to your doc. Fibroids may grow during pregnancy and in some cases can increase the risk of miscarriage, preterm birth, or breech birth. In rare cases, your doctor may recommend a myomectomy, or the surgical removal of fibroids. But more often than not, fibroids are nothing more than a pain in the butt, so don’t let them worry you too much unless your symptoms grow problematic.