My hubby has abnormal sperm. It took us about a year and a half to conceive, but our son turns 2 next month so I'd say it's definitely possible. We bought preseed for round 1 but never used it. The dr also recommended he take mucinex to make the liquid thinner. Based on a recommendation from a friend with similar issue during the timeframe, hubby also started a men's multivitamin. The cycle we conceived, we only made one "deposit" and used a softcup to put it in as hubby had had knee surgery two days prior.
We are trying for #2 now. We were NTNP for about a year and have now moved to the TTC category again. Will probably check back in with a doctor for both of us if no luck by New Year's