Pregnant women with prior venous thromboembolism (VTE) are at risk of recurrence.
The net benefit of antepartum LMWH in this setting is uncertain.
Pregnant women values and preferences for antepartum LMWH prophylaxis are unknown.
Most women with prior VTE choose antepartum LMWH; an important minority will not.
Shared decisions about the use of antepartum LMWH prophylaxis should be emphasized.