The list below will help you to understand the IgM part of this and how it relates to the 3 types of antibodies. Chances are, you've had the antibodies for a long time. I did too, and this is how I know.
When I got married in 1982, we had to have a test for syphilis which was required back then. I tested positive, even though it wasn't possible to have it. The test was a VDRL. They found out years later that people could have a false positive VDRL and if they did, it was part of the blood work that can be found in APS. They also discovered that many of those people eventually developed Lupus. I was 19 when I had that test. I was 35 when I was diagnosed with ITP and 44 when I was diagnosed with Lupus. I had weird blood work way back then, but didn't actually develop the disorders until years later. Some trigger came along, I guess.
A lot of women with APS antibodies have miscarriages. I didn't. I had three healthy pregnancies, which is a good sign that clotting hasn't been a factor all of those years. Since the antibodies can come and go, there is no reason to think that once I knew I had Anticardiolipin antibodies, I would start clotting. It took me a while to realize that. The same goes for you. However, the fact that you have migraines also adds into the mix.
What is frustrating to me is that people with ITP are not routinely checked for APS, even though articles state that 33% of people with ITP also have APS antibodies. Most articles state that the treatments for ITP should not change if one also has APS. I don't understand how that can be since both TPO's and splenectomies raise the risk of blood clots even without APS. I've been on the PDSA Forum since 1998 and have never seen as many clotting episodes as I have in the last few years. These are young people too.
Your doctors will most likely not have answers to your questions. This is not because they are uninformed; it's because they can't possibly know how long you've had it or what caused it. I can tell you that having the antibodies does not mean you have APS. APS is classified as having at least one of the antibodies and a clotting episode. Actually, a person should test positive twice in a six week period to be considered to hsve the antibody. I don't think this is something that you should worry about a lot, but it's good to be aware of it and see what the doctor says.
Physicians use a combination of clinical symptoms (see above) and laboratory tests to diagnose APS. The common blood tests for antiphospholipid antibodies are as follows:
1. Anticardiolipin antibodies (IgG, IgM, and IgA)
2. Lupus anticoagulant – a panel of blood clotting tests that may include the dilute Russel Viper venom time (dRVVT), lupus aPTT, mixing studies, and hex phase phospholipid test, platelet neutralization procedure
3. Antibodies to b2-glycoprotein I (IgG, IgM, IgA)
Panels of tests for antibodies to phospholipids other than cardiolipin are available but have not undergone the rigorous international standardization efforts applied to anticardiolipin assays. A number of experts in the field question the usefulness of these panels, which may be quite expensive.
www.apsfa.org/aps.htm#6
www.nhlbi.nih.gov/health/health-topics/topics/aps/
www.genome.gov/17516396