going two days without seeing baby..

Am I a bad mom? So basically me and my boyfriend got concert tickets as a present when I was pregnant and we were like yeah cool!! Not imagining it would involve leaving the baby for two days. 
We have to leave her because we have work on Wednesday, are gonna drive to the concert straight from work, and then stay the night at a friends so we don't have to drive all the way home and then all the way back early the next morning. So we leave Wednesday morning and won't get back until Thursday night. I'm really sad about leaving the baby overnight but I know she'll be fine I'm just worried. His parents will watch her at night and his grandparents will watch her during the day.
I just feel so guilty!! :( I know I should go out and have fun but idk how I'm gonna do this.