Please help

I wanted another baby so much. I have a little boy already. I’m 5 weeks pregnant. I feel different this time, I felt so ecstatic when I found out. Not the best time but I was so so happy. Now I’m suddenly feeling very alone. I feel very low and I need support. My partner wanted a baby too but since finding out he just seems distant and disconnected. Every once in a while he’ll say something cute or funny about the pregnancy but the rest of the time it’s like he doesn’t want to know. I need his support and comfort but it feels like he’s so far away when he’s only sat next to me. That happiness I had when I found out I was pregnant picks up every now and then but the rest of the time I feel so low and honestly depressed. It’s making me stressed and anxious, on top of having morning sickness, I’ve lost my appetite and feel completely drained. I haven’t felt this low in a LONG time. I know babies are such a blessing, my son is my entire world, it doesn’t help knowing that at this moment in time I’m pregnant and the baby is growing but it’s not an actual baby yet. I feel selfish because I wanted a baby so much and I’m so blessed to be able to get pregnant when so many can’t but I’m struggling to fight these feelings. Has anyone else been through this?