Embryology and practical observation disagrees with:
collection in womb for the 1st 40 days (5.7 weeks), then becoming a clot for another 40 days (11.4 weeks), and then a piece of flesh for another 40 days (17.1 weeks).
The dare and risk of the most daring daredevils of this world is nothing compared to what you, whom I call eternity risking daredevils, are risking by alleging such statements with certainty to Prophet Muhammad ﷺ .
Face the truth and seriously consider the evidences for your own eternity's sake!
Using this alleged Sahih Hadith, some people, derive the assumption that the rooh is blown into the fetus after 120 days and before that, killing the fetus is not as grave an issue as it is after 120 days. Before 40 days, some scholars assume using the Hadith, that it is just the sperm and an egg, but this is proven wrong by practical observation and verified Embryology.
Some scholars said that before 40 days, it's just a sperm and an egg - Shaykh Assim al Hakeem (Short youtube clip)
This must be stopped, no killing of embryo or fetus should be allowed.
Below screenshot is from page 173 of "The Bible, The Qur'an and Science by Dr. Maurice Bucaille" regarding a Hadith from Sahih Bukhari:
The Bible, The Qur’an & Science by Dr. Maurice Bucaille - PDF
Stream the relevant section of the book "The Qur'an, Hadith and Modern Science".
Real Photography of the human fetus growing in the womb (Video has music, you may mute the video)
For link to official Darussalam scanned page and Sunnah.com reference link, download the below PDF. Discussion on this issue starts on page 188 of the following PDF:
Decisive Sahih Hadith Content Check - Part 1 - The Sahih Hadith Bluff (100 MB)
Stream Online
Preview the pages
Decisive Sahih Hadith Content Check Project - The Sahih Hadith Bluff - Part 1 Sample - by Asim Iqbal 2nd
Youtube Video : Decisive Sahih Hadith Content Check Project - The Sahih Hadith Bluff - Full Video Preview