Hi, dear I have gone through your question. I can understand your concern. No need to worry about blood clots unless you are high risk person. Blood thinner can not be taken before surgery because it can leafs to increase the chance of bleeding. You can take blood thinner or warferrin after the surgery to prevent blood clot and pulmonary embolism. Consult your doctor and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using health care magic. Wish you a very good health.