Hi Amy,
I want to say that I'm very sorry again that you are experiencing this heartache. I know that nothing I could say will make you feel better but please know that I will continue to keep you in my prayers.
I would also like to say that having these additional tests are non invasive and may give you some insight as to why this may be happening. I was tested for the following:
Anticardiolipin Antibodies
Antinuclear Antibodies
Lupus Anticoagulant
Antiphospholipid Antibodies
And a whole bunch of other testing...(ie...genetic)
It is acually a part of a workup that is done for people who experience multiple miscarriages. This type of testing can be done for women who had a child and are experiencing multiple losses.
I think that ultimately you need to be comfortable with the decisions that you make so please do not feel that I'm trying to force any ideologies on you. Just want to make sure that you don't suffer unnecessarily if it can be avoided.
Keeping you in my thoughts...

Kim