Thanks for writing in to Healthcare Magic!
Preferably you should avoid all medication except those indicated for the well being of the pregnancy
, t-toxoid etc.
The cream of Alum is mentioned as contraindicated by the manufacturer and that is a straight forward contraindication for it's use during pregnancy.
Alum is a complex salt of aluminium which is itself toxic for baby and the brand may be having other contents as well.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!