Is my baby get enough milk?

Hi, i am a new mother. I'm struggling to give enough breast milk for my newborn daughter. She is 15 days. I pumped after direct feeding, and only get 1 oz. My surroundings said, i have less breast milk, need to top up for formula milk, but I really want to give my daughter only breast milk. Please help me! I became more negative day after day as they said i did not provide enough milk. My baby do gained weight around 0.2kg in 2 weeks time. She slept well, its just sometimes she's crying every hour.