Timeline issues

So my boyfriend and I were talking about ages last night. I said I’m 27 soon (he’s 24) and he said... so 27, that means you’ll want babies soon. I said no, lets get a house first, then get married, then have a baby.

He said what age do you want to have a baby?

I said maybe between 30-32.

He said so when I’m still in my 20’s.

I said well yeah I can’t help that you will be in your 20’s when I’m 30- but I would like to have a baby around 30-32.

He said I just want you to know I can’t give you everything you want, why don’t we just get a house and have a baby.

I said because you know I want to get married before I have a baby.

He said I know but weddings are expensive, and we don’t need to get married.

I said I know that, but it’s something I would like to do and I only want to do it once, and I want to do it before we have a baby.

He said okay but there’s really not much time in between then to get a house and get married.

I said it’s okay we’ll figure it out when the time comes. And then he just went silent.

I woke up this morning with a sick feeling worried that he wants to break up, and I think it’s just timeline related. We’ve been together 4 years, and he often brings up the topic of children and children’s names. And he has asked before how much he would need to spend on an engagement ring, and I said whatever you like- I will say yes to any ring. So I feel like he’s been aware of my timeline for a while, and has never had an issue with it, but now that I’m almost 27, he might be reconsidering and I’m not sure what to do. I don’t want to bring it up because I don’t want to panic him about the future. I know it’s going to be on my mind all day- and that sick feeling in my gut is telling me something is off.

Any advice please??