u/JustAnalyzing

I have a 20 month old who was exclusively breastfed and nurses once a day before bed since 15 months. He asked me around lunch today and I said no you can have it before bed. But then he didn’t ask again all day and he’s going to bed now. Will my supply just dry up overnight? Or will I be able to nurse him if he asks tomorrow? I am really sad because I didn’t think yesterday would be the last time. I am 10 weeks pregnant so I was planning on fully weaning before the next baby comes. But I want to know and plan the last time and communicate that to him.