Feeling like a shitty mom

We have a 2yr princess, shes sweet as can be and loves to play! Im currently 30 weeks pregnant with our 2nd our first boy. Today I barely played with her & gave her attention than usual. I've been cleaning the kitchen and doing laundry. Been feeling off, sad and moody just emotional-staying to myself. I love her to death shes everything to me i just dont know why I'm feeling like this. Shes very well taken care of. I just not been myself today and it makes me feel like shit. I do this every now and then. Feels like she deserve more and I cant give it to her. 😭😭😭 idk whats wrong with me