Final answer:
Preeclampsia is a pregnancy complication characterized by high blood pressure and proteinuria after the 20th week of pregnancy.
Step-by-step explanation:
The condition in which a mother develops elevated pressures and proteinuria after the 20th week of pregnancy is known as preeclampsia. This can pose significant risks to both mother and fetus and usually requires careful medical management. Gestational diabetes is characterized by high blood sugar levels during pregnancy, ectopic pregnancy describes an embryo that implants outside the uterus, and placenta previa involves the placenta partially or completely covering the cervix.