can men be the problem

Sweet love
Ladies please help with your thoughts?!!so my husband n I have a 7 year old boy he has a 12 year old girl as well. Well we have been trying to conceive for over a year almost two( hopefully it dsnt get to the 2 year) I took blood work I get normal cycles and blood work came out good. But still no luck! Could he be the problem? Yes we both have gain some weight. When I got pregnant of our first he was in shape now he has gain weight doesn't work out and doesn't eat heathy at all. I have urge him to go see a dr but he is scared of what they will say! Any suggestions. I've tried preseed and <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> nothing has worked. Should I get tested again?