Hi I am 24 weeks pregnant and have cold symptoms .. I went to ER 3 days ago due to feeling light headed and felt rapid heart beat palptation lasting few minutes, did not pass out. I don't have chest pain or pain when I take deep breath, emerge Dr did d dimer level and was 1050, did dopler and waS NEGATIVE for DVT, I am kind of worried about elevated d dimer , what could it be ? I do feel tired easily (I attributed it to pregnancy and cold )