Threatened miscarriage

In the threatened miscarriage leaflet. There is a section where it mentions if the mother is a negative blood type.. might need a injection etc etc.. Anyone here is a negative blood type, with a positive blood type baby and have a smooth pregnancy? Because im either bleeding or spotting and it is on daily basis. Duphaston doesnt help. - Im at 6 weeks. And been to doc multiple times due to the multiple scares i have. N baby is fine with heartbeat.