Hi EJE

I am so sorry to hear that you have had two miscarriages, even one is one too many. My great aunt has Lupus (and has a gorgeous adult daughter), it's not a nice disease to have, but if you have it one test should be conclusive, at least, and you should have other signs. Lupus is an autoimmune disease whereby the body recognises itself as foreign and attacks the organs - so yes, it could attack a placenta/foetus, but you may have had other signs by now.

The UK lupus site has a fantastic pdf pamphlet you can download on lupus and pregnancy - basically it says that:

Recurrent Miscarriages

Lupus Patients should all be tested for antiphospholipid antibodies (see antiphospholipid (Hughes) Syndrome). If these tests are positive there is an increased risk of miscarriage and patients are treated accordingly - either with aspirin or heparin during the pregnancy. In those patients with lupus who are anticardiolipin negative it is probably true to say that there is not an increased risk of spontaneous miscarriage.

Will my baby be fine?
Lupus mothers have normal babies. However, there is one congenital problem which has been described in rare cases. Approximately 1 in 1000 babies (0.1% of babies) of lupus mothers are born with a slow pulse rate, so-called congenital heart block. This congenital abnormality is only seen in offspring of mothers with a particular antibody - antiRo (see fact sheet on Lupus and Laboratory Tests).
Anyway, to demystify some science, the phospholipid stuff is the stuff that forms a protective layer and surrounds your cells, holds them together and lets the antibodies recognise the cell (basically, imagine a balloon that can say "hi, I'm me" or "hi, I'm a nasty flu bug" - the surface of that balloon is made up of phospholipids).

Cardiolipin is a particular type of phospholipid - a normal one has 2 "tails", these tails sit inside the cell; cardiolipins have four (2 inside, 2 outside), they're the type that allow easy recognition of who the cell is.

Ro is a nuclear antibody, so found inside the cell near all the DNA and can sometimes mess up the signalling and recognition process.

I hope that some of this was helpful.