Blood in Semen!!!?!! HELP!

So my hubby has blood in his semen. Started about 3 weeks ago when we had rough sex trying to spice up our TTC efforts. Seeing it makes me nervous. This is the 2nd time in a year. First time dr. thought it was a tear in his seminal vesicles and it cleared up with antibiotics. 
My hubby is an otherwise healthy 31 year old man. No history of prostate cancer in his family.
Has anyone else experienced this? Should I be worried? Will it hurt our chances of getting pregnant this month??