We hope?

hi all,

i feel like I'm going to sound moaning and with so many of you facing terrible news my issue is tiny. 

My husband had / fighting cancer and had rchop and then radiotherapy for cancer in his chest. We think this has gone but are waiting for more confirmation, yey! 

Whilst we fought the cancer our life was put on hold and we never got round to getting having children and we couldn't freeze sperm in time due to the risk of the tumour, we had to start treatment ASAP. 

We have been trying for a baby but we are now 8 months treatment free and no sign. Do you think we have any chance of the sperm coming back or has this gone forever? Is anyone else going through this?