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hCG is secreted by the trophoblast soon after implantation and is the hormone detected by pregnancy tests.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation
In early pregnancy, the corpus luteum is the primary source of progesterone until the placenta takes over later in gestation.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Menstrual Cycle Fertilization Implantation Pregnancy Parturition Lactation
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