welcome to hcm
thanks for the query
have you taken anti D prophylaxis after your previous abortion?if not then it may cause problem to your future baby. but if you remain in regular visit to the doctor then it can be avoided.
if you have taken anti D , then no need to worry.
if you have not taken it then you can go for indirect coombs test
for the antibody titre at 12 week of this pregnancy
. if it comes negative then repeat it every month starting from 28 week. if the test comes positive then amnoicentesis can be performed in between 28 to 30 th week. accordingly from the optical density of the fluid your management plan will be given by your doctor