Ive talked to some dudes lately about trt and cycles and shit, they all told me in worst case you just gotta go off trt and supplement hcg and clomid, or hmg (menotropin) and then you can knock up a girl even on gear.
I guess being primary hypo is worse for fertility since its directly an issue with the balls, secondary hypo would be the case where hcg/hmg are used to make u fertile since the glands dont send out signals anymore.
But its just what i found out through research, apparently neither primary or secondary hypo is a reason for infertility, but @Dr.Jim or
@Eman can explain better or know more about it