In the same situation but I'm only 6m pp so going to wait for the 18months as I had an emcs and see how I feel then...if I'm not ready that's fine with my husband too as long as I'm comfortable and on board is what matters to him and me. After all we do go through the brick of it all to be fair.
I found the first year really challenging. I felt really lonely, overwhelmed and it took a toll on our relationship. We'd always discussed having two children but with that I thought there was no way even though I knew deep down I still wanted two. Fast forward to our son turning two and my husband actually brought up having the second child as we were in a really good place again. For us it just took time and you'll know if/when you're ready. I'm 19 weeks now with our second
I don't have any advice, but just wanted to say that I'm in a similar situation. I know my husband wants another one but I'm still trying to decide if we will be one and done, even though I also very much feel like I want to have another.