It is an autoimmune disease, it doesn't run in families before it is created so you could be the first in your family to have it, but your siblings and your parents grandchildren, greatgranchildren etc would be at risk.
It attacks the lining of cells, effectively making your allergic to everything, including everything within your body. Fortunately it doesn't usually work out like that. Because of what it does it masks itsef as other autoimmune diseases so is often missed because of the secondaries. It also causes clotting (because it is attacking the blood) making the person at higher risk of TIA (which I found out is why I faint a lot ), PE, DVT... It attacks the placenta in pregnancy causing the things both of you describe (can just happen anyway, but that's why I picked on your posts) IUGR, HELLP, spontaneous premature birth (placenta calls a halt to the pregnancy, basically), PreE.
As you can probably imagine, it is a very complicated disease and the Foundation is probably your best place to have a look for more information (although it is a little on the extreme side of it and it doesn't always come like that). Google the terms "Hughes Syndrome" and "Antiphospholipid Syndrome".
Part of the problem is how recently recognised the disease is, as an illustration, I know people who see Prof Hughes for their treatment.
If you feel that it is something you want your Dr to explore, ask for a full (full means full with this lol, I've had 9-11 vials a time) screen - it must be repeated after 6 weeks with both showing positive to be positive. If you get a negative on APS, there is still a chance it will pick up something else as the test is quite wide ranging.