Two jobs

Since finding out I'm pregnant I've been working two jobs to save up money for doctor visits and baby supplies. My main job I work 8-5 Monday thru Friday. The second job I work evenings and weekends. I'm so tired and grumpy. My second job is retail and kicks my butt, I can hardly walk at the end of my shifts because of my back pain. How do you moms stay focused when you are exhausted and overwhelmed? 😢