Hadith about Gathering in the womb for 40 days

There is a famous hadith about embroy in womb mentioning alaqa,mudgah and nutfa stage.Ref:bukhari 3208.Here in this hadith it states"إِنَّ أَحَدَكُمْ يُجْمَعُ خَلْقُهُ فِي بَطْنِ أُمِّهِ أَرْبَعِينَ يَوْمًا، " and translation is "Creation of each of you is put together in the womb for 40 days".I know some scholars say that alaqa,Mudgah and nutfa all happen in the 40 days it is not 120 days. Interpretation of 40 days is acurate according to modern science.But my question is how can we explain the Gathering of Creation in Womb for 40 days?what is actually gathered in the womb if we interpret the hadith in a way that all stages take place in the same 40 days not individually 40 days?