Being on a cycle will not prevent pregnancy. Studies have shown that higher estrogen levels INCREASE your sperm count. While taking an aromitizing
AAS you will increase the count, UNLESS you are on an antiestrogen like Nolva or Arimi. This will cause sperm count to be lower and thus reduce your chances of getting someone pregnant. I am a perfect example of that...i tried getting my wife pregnant while on a cycle, and it didn;t work. However, after 4 weeks being OFF cycle, it happened. The reason being, I was taking 40mg of Nolva ED during the cycle and for two weeks after the cycle ended. Two weeks after PCT stopped, she was knocked up.