I feel like a horrible wife and mother

I have 2 girls ages 5 and 2 and I take care of them as far as feeding, cleaning and getting whatever they need throughout the day, but this fatigue is seriously kicking my butt. We leave for Disney in 2 days and so much needs to be done but I'm so nauseous and tired that I feel terrible bc my husband doesn't understand how I could be so tired. He thinks I'm just lazy. With my girls I felt great, no nausea and I was tired, but my oldest was 3 and potty trained and extremely independent. Anyone else feeling like this? My intentions are good, but I could sleep all day if I were allowed to! I'm 10 weeks 4 days