Low sperm count

Ana
I don't know if this is the right group to post this but here I go. My husband was married and divorced when I met him, while being married he had a vasectomy. Well we got married 8 months ago and six weeks ago he had a vasectomy reversal, yesterday we went for a check up and the doctor said his sperm count is low, would that increase with time? Anyone knows?!! What can we do??? I don't have any kids of my own he has three from his previous marriage! We really want to have one baby!!