Thanks for the query.
If betablockers are used in late pregnancy
as in yours,it belongs to category-D FDA.
There have been reports of slowed intrauterine growth, small placentas, and birth defects related their use during pregnancy. It also causes very low heart rate
, low blood sugar
levels, decreased breathing in some newborns when beta blockers were given to the mothers near the end of pregnancy.
So benefits have to be weighed against the risk involved to the fetus.
You need to discuss with the cardiologist for the same.
Wish you good luck.