It is better to take anti D as early as possible after abortion but it can be taken even upto 7days for whatever little benefit.
Next Steps
If you have crossed that period there is nothing which can be done now.
During next pregnancy we can check for your antiD antibody levels and monitor your pregnancy.
Health Tips
You will not have any problem if sensitisation did not occur in this pregnancy. So there are fair chances that everything will be normal in the future pregnancies.