A 37 year old primi Rh negative patient is very concerned above her pregnancy at this age. Her pregnancy is 16 weeks and she is HIV negative, hepatitis B surface Ag neg, Rubella non immune and has no complain.Her triple test report is normal but still due to her age she insists on getting an amniocentesis done.Which of the following is the next best step in management:
A
Advise against amniocentesis as it will increase the risk of isoimmunisation
B
Follow Rh titres carefully and give Anti D if evidence of isoimmunisation is present
C
Give Anti D at 28 weeks of pregnancy and after delivery if baby is Rh neg