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The risk varies with the type and size of fibroid
. If large and/or multiple then more risk. Regarding Rh negative pregnancy
, you need to get the Anti-D or Rho-Gam injection. It is given by intramuscular injection
as part of modern routine antenatal care at about 28 weeks of pregnancy, and within 72 hours after childbirth. You need to get ultrasound
of your foetus regularly which can monitor if any damage is there to the fortus along with doppler testing. Most pregnancies risk is less if the injection is taken. Kindly speak with your Obstetrician regarding the risk in your case and possible ways to prevent foetal risk.