Exclusively pumping supply amount?

I recently began to exclusively pump for my 7 week old baby. I added my numbers up for today and I have pumped over 1000 mL of breastmilk. She eats 520 mL a day. I'm absolutely terrified of my supply decreasing because I want her to get strictly breastmilk for as long as possible, but at the same time I feel like this may be a little too much breastmilk.
Thoughts?

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