Anytime you lower your sperm count, then yes, it is harder to get a girl pregnant. If you've been using a lot of
Test for several months, then there's a good chance your sperm count is down to significantly less than 1 million, when you normally shoot out 10 + million of the little guys.
Personally, I wouldn't be on
Test or any other anabolics and be trying to get my wife pregnant. However, if I didn't want kids, I also wouldn't let her go off her birth control, just because I'm on a cycle.
MaxRep