Baby #2 (technically 3)

I just found out I’m pregnant. I’ve only done a home test and I’m not very far along but I’ve been freaked ever since I found out. My baby will only be 21 months when this baby is born. I’m really worried about child care cost. I already spend $300 a month for one child to attend day care. Anyone have advice or tell me it will get easier or that it’s easier than I’m thinking it will be? I’m a teacher so the hours are decent for a second child. Plus, this baby will be due at the end of the school year, so I will have all summer with for the kids to adjust to each other.