Im a 47 year old male, and had CABG surgery last May.  About 7 weeks post-op, I had an episode with blood in urine.  In June last year I had an ultrasound of kidney and bladder and it was clear.  Urologist did Cystoscopy in July 2012 and found lesions on bladder and prostate (maybe from surgery urine catheter?)  Since the CABG, Ive had visible blood in about six different episodes.  At one point, between July 2012 and February of this year I had nothing.  Had three similar episodes beginning February, March and June of this year.  During these past 3 episodes (similar to others) I passed blood / small bright red clots and then it was clearer and went away within a day or so.  I was on Plavix and discontinued that this February.  Currently taking 81 mg aspirin, trilipix, multaq, Lipitor, toporal, niaspan, 360 mg of Omega 3s.  I had bloodwork done just in April and all was normal, urinalysis showed WBC Esterase 1+ Abnormal, WBC 6-10 Abnormal and Crystals = Present Abnormal.  When Urologist did Cystoscopy he cortirized lesions and I was fine for about 6 months until this Feb.
As aspirin is blood thinner, and it causes loss flatlets leading to the problems written by you and there can be lesions seen in area of bleeding and there is super added infection leading to WBC I think if you check platelet count it will be less and you need to stop aspirin or replace it with some other salt in consultation with your doctor