So Many things going on

Being a working mom takes a toll! I have been working now for 2 months, and I am starting to wonder if I did the right thing.
I have to be to work at 7:00, and that means that Josh my oldest has to get the kids out the door in the morning.
So the other day I am at work and I get a call from Lili, she forgot her luch. So that made me sad, becasue I couldn't drop everything and run it to her. I had to call my dad and he ran her luch.
Same week Mary has an accident in class becasue the teacher didn't see her raising her hand. Instead of calling me she finishes out school( I felt like such a bad mom)
Every morning my girls say please don't go to work!!
I know it is for a short time, and only to save some money to pay bills, but I always said that my kids come first, and I just don't feel like they are.
It would be so much better if I could get them off to school and be to work at 9 and then be home by 1 0r 2, but they place I work needs me there at 7.
What to do?? Or how to feel better about working.
I love the Job, I meet so many people everyday, and get to talk to so many nice people. I hope it gets easier.