To know the reason why your wife do not conceived, you and your wife should have a test in hospital. If you doubt that you have necrospermia or aspermia, you should have a semen test and prostate test.
Necrospermia and aspermia often caused by prostatitis, epididymitis and spermatocystitis. The herbal pill - Diuretic and Anti-inflammatory Pill is such a pill that good at treating necrospermia or male infertility caused by diseases like prostatitis, epididymitis, orchitis spermatocystitis and so on. And the pill has no side effect.
Any other question is welcome.