Hi, I knocked my bump earlier on a shopping trolley quite hard... One of those embarrassing shopping trolley moments. Anyway I can feel the baby so I know i don't have anything too much to worry about but i'm not sure what classes as an ' abdominal injury ' as it just says you need an anti d after an abdominal injury! Am rhesus negative and am 26 plus 4 so am due to have anti d anyway next week. Are there risks if i don't have the injection?