Is it possible for placenta to desperate from uterus from heavy lifting? and would u know if it happened?

Placental abruption: If the placenta deprecated from the uterus you would experience severe abdominal cramping that sometimes results in bleeding that is hidden behind the placenta, and sometimes comes out... You would also have abdominal pain.

Unlikely.: Heavy lifting is not likely to cause separation of the placenta from its attachment to the uterine lining. Placental abruption is more commonly caused by maternal high blood pressure or blunt trauma to the abdominal wall or on rare occasions when the membranes rupture.