Thanks for your query.
The cause of your intra uterine death of previous baby at term has great relevance for this pregnancy.
I wish you would get back with the details of the testing done, as " unexplained " IUD is often a last resort diagnosis after an exhaustive work up.
Common conditions causing such death and work up indicated are -
genetic and chromosomal abnormalities in the baby ( requires post mortem analysis of the delivered dead fetus and placenta with membranes )
Chronic maternal diseases like diabetes, hypertension
, cholestasis, chronic renal disease
Autoimmune conditions ( antiphospholipid antibodies, coagulation disorders etc )
Intra uterine infections ( parvovirus etc )
blood group incompatibility
and hydrops ( swelling ) in the fetus due to various causes.
In this pregnancy, it is safe to take the medications mentioned, as they are often prescribed in unexplained previous obstetric losses.
They are progesterone
preparations and are given to support the pregnancy.
All 9 is quite sufficient for folic acid.