If you do have it- i dont think it effects you in early pregnancy- a friend of mine does actually have it- and it more of a concern later in the pregnancy as it can cause clots in the placenta.
That's weird SB cos my sis had a miscarriage at 8 weeks because the baby stopped developing cos of the placenta wasn't right - and then she had a stillborn because her OB told her to stop taking the aspirin (cos she has c-sections) a week before the c-section date.