Thanks for your query.
After the injection has been given , the test would obviously be positive.
Once the Anti D injection has been given to the mother, there is no point of doing the ICT, as it will automatically become positive.
if ANTI D has been administered, please do not worry about the test.
IF it has not been given, then serial ICt should be done.
Above a critical level, fetus might require intrauterine blood transfusion
ALl the best.