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.
1 Benign prostatic hyperplasia (BPH) involves enlargement of the prostate gland. 2  The prostate enlargement in BPH is not malignant. 3  BPH can impede the flow of urine.  Symptoms include frequent urge to urinate, getting up at night to urinate, difficulty urinating and dribbling of urine.