Inclusion Criteria:  current VTE previous history of VTE class III obesity history of placenta mediated complications pre-eclampsia Advanced Maternal Age inherited thrombophilia prolonged immobilization varicose veins other risk factors that predispose them to VTE  Exclusion Criteria:  life-long anti-coagulation mechanical heart valves other forms of injectable therapy for other illnesses long-term severe physical disability affecting mobility (eg: paraplegia, paralysis