I need some advise on pumping

I am 9 days postpartum and have been breastfeeding my daughter since day one. My doctor suggested that I pump 5-10mins after a feeding to help with increase my supply. Each time I pump, i tend to only get about a teaspoon worth of breast milk out and that's from both breast. Am I doing something wrong? Or does it just take time to pump more? when feeding my daughter, I usually feed her ever 2 hours or when she's hungry which could be sooner than 2 hours. I just always feel like I'm not making enough milk 😯 What are some tips and tricks that helped you to increase your milk supply?