Don’t forget it takes 2 to hit paydirt when it comes to having children. You could be off the charts with your sperm count and still having issues. Think about all the couples who don’t cycle and still can not have children.
I’m lucky with four young men, even had a 2 for one special. 
Well FSH is responsible for sperm production, and obviously when you are on your body is producing close to no FSH. So I guess one would assume that it is a lot harder to have kids if there are no sperm being produced
Yes, obviously. That’s why you take things to raise it and or lower dosage(s) or just come completely off for a brief period.