Pumping advice

Katherine • "Females are strong as hell."

Hello mamas! I need some advice. I have a 10-day-old, he's EBF, and I would like to start pumping to have a backup supply. But my little boy eats every 3 hours, and I feel like he drains me dry every time. I tried to pump 1 hour after a feeding today, and was only able to get a tiny bit of milk. When do I pump?? I'm afraid that if I pump when my breasts are full, there won't be any left when he's ready to eat...