For pregnancy for someone with history of uedvt...what is diff b/w heparin and lovenox (enoxaparin)? why would one also be on baby aspirin?

Heparins, etc: Unfractionated Heparin (UFH) can be given IV or sq (as prophylaxis) and was used historically and is used now especially if want to turn on/off and be able to reverse it (w/ protamine). Enoxaparin (lovenox) is a low molecular weight Heparin (lmwh) that can be given subcutaneously (sq) for prophylaxis or treatment. Aspirin is used more to prevent arterial (mi, tia, stroke) not venous clots.