Thanks for the query.
Susten is progesterone
which will help in maintenance of pregnancy
. In case of threatened abortion
it can help to some extent in preventing the progress of abortion.
But in case of incomplete abortion
where there will not be viable fetus only retained products will be present. In that case susten may not help.
So your doctor might have thought it to be threatened abortion.
In that case your wife can use these tablets and can go for review scan on 12th.