Several hormones like $hCG, hPL$, estrogen, progesterone are produced by

By the and of the second month of pregnancy the foetus develops........

$A$ : If fertilization occurs, the corpus luteum is rescued from regression by human chorionic gonadotropin, which is produced by placenta.
$R$ : In first trimester the corpus luteum stimulates by $hCG$ is responsible for the production of progesterone.

During pregnancy the level of which hormones are increased ?

Placenta produced which hormone

The hormone released from placenta is