Is a husband considered unjust to his wife when he continuously cares for his mother, and is using an IUD to prevent pregnancy religiously forbidden because it prevents the implantation of the embryo after its formation?

A mother is a door to Paradise, and her contentment is from the contentment of Allah. It is incumbent upon the son to combine dutifulness to his mother with the rights of his wife. If the wife is content with the husband spending most of his time with his mother, then there is no harm. If the wife is not content with that, then the husband may provide a servant to care for his mother, and all children must equally share in caring for their mother. As for completely preventing conception, it is not permissible except out of necessity. The least harmful contraceptives must be observed, and the use of the IUD, which leads to abortion, must be avoided.