Hi, I'm 21 Years Old And Me And My Husband

Hi, I'm 21 years old and me and my husband are trying to get pregnant it's only been a month of trying but we are determined and excited to want to be parents. I'm 5'8 and 112 lbs, so I'm underweight. It's hard for me to always eat right and not miss meals due to work. Is there any ways to improve getting pregnant or any fertility drugs to increase my chances ?