Help with DH's SA


My husband just had a SA today. We have the results but have not spoken to a doctor yet for further advice. Anyone's significant other had similar issues and still conceived naturally? We've been trying for a year. We already have a 4 year old together and DH has gained a considerable amount of weight since then. Could this be the cause and weight loss simply be the answer? Any vitamins recommended? Just want to get on top of things right away. Thanks for any advice you can give