Thanks for query,
It happens many a time that undescended testes
due to raise temperature in the abdomen may not grow properly and may go atrophied.
Now go for testicular biopsy
of rt testicle and see that production of sperms are there or not.due to atrophy
if it is absent,nothing to worry your left testicle is alright and there is no problem for issue.
Your marriage life will be fine.
Preserve your normal testes carefully.
ok and bye,