At what stage of pregnancy does the placenta embed itself in the uterine lining?

The placental tissue, known as trophoblast, begins to 'invade' the lining of the womb within days of the embryo implanting. This process is starting to happen at around the time of your missed period (4-5 weeks) and continues until about 24 weeks.

How the placenta works
Where the placenta adheres to the womb wall, it consists of very fine blood vessels that contain fetal blood. These are enveloped by pools of the mother''''s blood and this is where fluids, nutrients, and gases are exchanged.

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At what stage of pregnancy does the placenta embed itself in the uterine lining?

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