Horrible mom

I feel like a worthless, terrible mom to my 2 year old. I was very confident in my parenting, I knew I was a good mom. Not anymore. Im 38 weeks pregnant and I dont know how I've made it this far. Im so tired, in pain, I've been feeling nauseas the past 3 days. I spend all day on the couch it seems. I cry every day and just feel like I'm not doing a good job and it hurts me to feel like I'm letting my daughter down.