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Fibroids-especially those located in the cavity of the uterus-may increase the chance of a miscarriage or may cause a woman to go into labor before her due date (premature labor)
This happened to a GF of mine - hospital tried to fob it off as BH contractions but lucky her OB knew what it was - prem labour at 25 weeks. She was presrcibed bed rest for rest of pg and also medication used to control high BP. But in the end bub was overdue (go figure!!) and turned out fine - no labour complications to speak of.