Donating milk?

So my baby is just over 2 months old. And I’ve only breastfed since she’s been born. I only started pumping at 6 weeks (3 ish weeks ago) when the drs let her sleep through the night. So I was heavily considering donating some milk. I have collected about 400 oz in just those 3 weeks. And all of it has been throughout the night. Well since I talked to my husband about it I’m not pumping nearly as much per night. It’s not like a terrible amount but I’m now nervous of the what ifs! Is it normal for our supply to start to regulate now? I guess I’m just nervous of something happening and than I don’t have enough milk. I still plan on donating because I have tons for now.