Al-A'raf · 7:189

189. It is He who created you from one soul, Prophet Adam (peace be upon him), and created from Adam (peace be upon him) his wife, Eve, creating her from his rib, so he would be close friends with her, and find peace with her. When he had relations with her she became pregnant with a light load, not noticed because it is at the beginning of the pregnancy. A woman continues with the pregnancy going about things without finding it heavy, until she becomes heavy with it when it has grown in her belly, the two of them call upon their Lord, saying: 'O our Lord, if You grant us a healthy child, we will be thankful for Your blessings.'