Thanks Deb,
I found this and thought it was interesting....
"Women who have had a VTE more than three months previously and who are still receiving a therapeutic dose of LMWH can be switched to a prophylactic dose at 38 weeks' gestation, allowing spontaneous labour to occur. Again, LMWH are withheld at the onset of labour (C2). Alternatively, if a woman wishes to be assured of access to epidural anaesthesia, induction of labour can be offered, with the last dose of LMWH on the day before the day of induction (C2). "
From; eMJA: A Working Group on behalf of the Obstetric Medicine Group of Australasia et al., Anticoagulation in pregnancy and the puerperium

Tanya