Going back to work

So I EBF and I'm going back to work in a few weeks and I'm so sad!! I'm afraid my baby will start to just prefer a bottle since that's what he will be having while at daycare and I love the bond through breastfeeding!! Also I don't really know how much I should send to daycare with him. I'm new to all this. Can someone kind of share their story with me if your in a similar situation and how much you normally send. I don't really want any of my milk to be wasted so I'm kinda lost at how much I need to send. He eats about every 2 hours. He's 4 weeks right now