Low sperm count

My fiancé (23 y.o) previously went through a sperm analyst and just recently we recieved the results. We were told he has a low sperm count. Has anyone else had this happen before with their partner? 
​What happens next? 
​How do they treat it? 
​Will / can we concieve? 
​It's very upsetting and Id love to know if anyone else has gone through this same complication while trying to concieve?