Hi (((S.))) - Found this on the internet. Hope it helps.
Women who have this condition are often advised to take low dose aspirin throughout their pregnancy (75 mg daily) on a daily basis to thin the blood. In addition to this, in some cases it may be appropriate for other medication (anticoagula-tion such as warfarin or heparin) to be used to thin the blood further. The majority of women with this problem will be using heparin injections daily throughout the later stages of their pregnancy.
This is an area that is relatively new, and research is ongoing.
Heparin is safe to use in pregnancy, as it does not cross the placenta. It is the most common anticoagulant used, and has been around for a long time. The only concern if heparin is used for a long time (more than six months or so) is that it there may be a risk of osteoporosis in the woman. Pregnancy and breastfeeding themselves cause a temporary thinning of a woman's bones, and being on heparin may make this worse. Both heparin and warfarin are safe to use while breastfeeding and do not have any harmful effects upon the baby.
Warfarin is usually preferred as it can be taken in tablet form and as it avoids the risk of osteoporosis. You do always have a choice. Remember though, that your specialist has your health and your baby's health in mind when he or she gives you advice. The risk of thrombosis is a significant one, and the treatment that is being proposed is a small price to pay to reduce this risk.
Yours sincerely,
The NetDoctor Medical Team