Fibroids in Pregnancy By Lara A Friel, MD, PhD, University of Texas Health Medical School at Houston, McGovern Medical School Reviewed / Revised Oct 2021 | Modified Sep 2022 View Patient Education Fibroids may increase risk of Preterm labor Abnormal fetal presentation Placenta previa Recurrent spontaneous abortions Postpartum hemorrhage Rarely, fibroids partially obstruct the birth canal.