The creation of Allah cannot be changed at all. As Allah Ta’ala says in Surah Rum:
The nature created by Allah will never be changed. Surah Rum(30:30)
Using IVF is an extraordinary case. This might lead some to think that this is like changing the creation of Almighty Allah or a violation of nature. However this thought is not correct. Changing Allah’s creation would be if the features i.e. the face, eyes, nose, ears, etc. are mutilated or disfigured the way it was done in the pre-Islamic days. It would have been a violation of nature when the scientists were ‘creating” something on their own. In this case, what happens is that when due to some disease the embryo cannot be formed inside the body, it is being formed outside in the laboratory using IVF and then implanted into the womb of the wife. This is not against nature as the phases of conception, pregnancy, etc. are the same. Neither is a new way of giving birth to children being invented here. The weakness found in the man and/or woman is being compensated for using an advanced medical technique. However, because of prohibited acts, there is some degree of undesirability in this.