Thanks for writing in to Healthcare Magic!
These medicines can not be called birth control medicines rather they are medicines of Medical abortion
They do not result in long term effects so to affect the baby but 5 times use is too much.
Their use is associated with excessive bleeding and that much use can lead to anemia
and poor general health and that can affect the pregnancy
also, but not the kidneys certainly.
Please get the CBC of your wife and if her hemoglobbin permits she can continue with the current pregnancy.
It is wise to avoid problems and learn from one mistake- I would suggest to get Copper-T inserted for future if you decide for abortion.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!