first trimester of pregnancy

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... of hCG in your urine as early as 7 days after conception. This hormone is produced by the placenta (an organ that develops in the uterus during pregnancy) and increases steadily throughout the first trimester (8-10 weeks) of a normal pregnancy. This

... is secreted by the ovarian corpus luteum in the early stage of pregnancy. It has a significant morphological effect on the endometrium .The main function is to maintain pregnancy, which is secreted by the placenta in the middle and third trimester