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| Description: hCG levels peak at about the 9th week of pregnancy. The chorion secretes estrogens after the first 3 or 4 weeks of pregnancy and progesterone by the 6th week Picture Stats: Views: 157 Filesize: 121.06kB Height: 515 Width: 556 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40536 |