my husband and I decided we want to try to have a child. the part that has me concerned is I have a…

my husband and I decided we want to try to have a child. the part that has me concerned is I have a rapid heart beat, my doctors have told to try and have children young due to that, and he has low counts. I feel like we're fighting a loosing battle. I'm just not sure what options we have at this point in time. any suggestions?