Overwhelmed

I'm pregnant with baby number two and we are so very excited! Working full time as a home health aid and bringing my 2 year old to work with me every day is becoming very overwhelming tho. I'm so exhausted! My toddler doesn't usually sleep through the night and my bf has a dangerous job that he needs to be rested for so I'm the one who gets up with her. I'm so tired I can hardly function and I'm snapping at my family. Then I feel even worse because they don't deserve it and I feel even more overwhelmed. Like I'm failing. Does anyone else feel this way?