I'm exhausted

I found out I am pregnant today. We already have a 3 year old. For a couple of days I've been feeling horrible. I'm exhausted like I've never been before even when I was pregnant my first time. And I feel super nauseous and plus there were other issues with my body that had nothing to do with my pregnancy. And my husband has been off for a few days. I have been doing the best I can with cooking and cleaning and just being there. It's been really rough. So today he found out and he was happy but them our son woke up early from his nap and my husband was awake playing video games and our toddler was playing and I accidentally fell asleep and he asked me if I was just going to be asleep and I apologized. Then he said ugh our son shouldn't be home all day for the past couple of days. It's also just been really hot. I apologized and said I'm doing the best I can do. And he said he understands how I'm feeling but I should see his point of view. I completely understand what he's saying. No excuse but my body is not doing well at all. I think I'm just venting and I know it will get better and I'll try harder but I want to cry right now I feel like a horrible wife and mother because I'm so tired and sick.