Many think of it as 'sticking.' implantation in humans always occurs when the embryo is between 6-7 days old. A very popular concept on the internet now in 2012, 'implantation bleeding, ' is speculative and mostly not useful.
Also, urinary stones can form in the bladder lining due to an accumulation of debris and chemicals. Broken blood vessels can cause blood in the urine, often because of torn or enlarged veins on the inner surface of the prostate. Blood in the urine also can be caused by the sudden stretching of the bladder wall.
Please correct the issue, then click Submit. My first worry is to at some point get a cystoscopy to make sure that you don't have a bladder tumor that is a common cause of bleeding. Another common cause is simply blood vessels in and around the prostate they can bleed easily, especially with blood thinners.