The purpose of this study is to learn how medications participant will receive in the course
of their delivery are metabolized (broken down by the body). The investigators hope to learn
more about the way drugs are metabolized by pregnant women, and how those drugs are
distributed in the blood and body compartments and cleared in the urine, and how maternal
body weight affects the metabolism. With this information the investigators will be able to
develop a treatment regimen considering factors in the body that affect magnesium levels so
that the investigators can improve treatment of pregnant women. The goal of the study is to
understand how different dosing of magnesium sulfate affects blood levels of the magnesium in
larger women.