Hello,
Anti-D cannot harm your baby and the injection around 28 weeks is highly recommended. It protects your baby from risk of Rh incompatibility and further complication. An other thing, you may need again after delivery if the baby is found to be RhD-positive and you would like more children.
Continue Iron/ Calcium supplements, protein rich diet, avoid long journey/heavy work, maintain personal hygiene, take adequate rest and repeat scan after 4wks for detailed feto-placental well being. Do periodic check up and suggestive investigations.
Be well and wish for successful motherhood.

hi there
am dr.surendiran
nice to meet you here in HCMagic
NOTHING TO worry,just be cautious ,A dose of Rh immune-globulin may also be given if a woman has a miscarriage, an amniocentesis, or any bleeding during pregnancy.,that is normal to protect the next pregnancy

If a doctor determines that a woman has already developed Rh antibodies, then the pregnancy will be closely monitored to make sure that those levels are not too high.
In rare cases, if the incompatibility is severe and the baby is in danger, a series of special blood transfusions (called exchange transfusions) can be performed either while the baby is still in the uterus or after delivery.

in extreme cases ,Exchange transfusions replace the baby's blood with RBCs that are Rh-negative. This procedure stabilizes the baby's level of red blood cells and minimizes further damage caused by circulating Rh antibodies already present in the baby's bloodstream.

Because of the success rate of the Rh immune-globulin shots, exchange transfusions are needed in fewer than 1% of Rh-incompatible pregnancies.
so do not worry, just a regular check up is needed
hope helped your query
regards dr.surendiran hcmagic