Keep going.
Every workout, every meal, adds up.
Since you are trying to build up--make sure you are eating some lean protein, healthy fats, and some quality carbs--every two-to-three hours
Boneless and skinless chicken breasts work good for protein, and things like nuts and sees work good for healthy fats--for carbs, this depends on your metabolism--but, vegetables and things like yams are good choices.
Hope this helps.