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The blood in semen is called hematospermia. I would say there are various possibilities for hematospermia. Some of these are
Infections including STDs
Inflammation of the prostate, epididmysis or urethera
calculi (stones similar to stones of kidney in the seminal vesicles or prostate
Polyps of urethera
Benign or malignant tumors of the bladder, seminal vesicles, testicle and bladder
In my opinion there is no such thing of waiting for a week in medicine especially if you are getting blood in semen. The blood in a semen is a serious symptom and need to be throughly investigated along with consultation of Urologist.
I can give you the possibilities here because exact diagnosis is not possible without examination.
Best wishes and keep in touch
Dr. Amir Javed