Hi and welcome to HCM.
isnt the first thing to thnk of. Unexplained bruises is common symptoms and most causes are benign such as trombocytopenia or clotting factors defficiency. YOu dont have to go to ER, but in short time do detailed blood work to rule out haematologic disorders. Also some women have predispositions for veins breaking. If you have normal red and white blood count then there is no risk of leukemia.
WIsh you good health.