You are lucky that you don't feel bad. Some moms feel so awful that they end up in depression, do a terrible job at work, and make everyone around them miserable. When I had to go back to work, it was hard. I couldn't remember stuff, and would have to write pages of notes to help me get through the day. (The person who first said that half of our brain is delivered along with the placenta knew what she was talking about!) My boss fussed at me asking if I just needed to go home for a while. I told him that it wouldn't help.
To be honest, I felt like I was learning wondeful methods of how to take care of my children from the daycare ladies. Most of the ladies were wonderful. I knew my children were well cared for, and that it didn't hurt them that I wasn't with them 24/7. When they got older, I think they needed me more. As teenagers, it is great that I am home when they get home from school. They KNOW I'm paying close attention to what they do and who they are with.
So enjoy your job and your baby. And don't give moms who want to play the "I'm better than you because I stay at home with my kids" game a chance to do that by asking if you are a bad mommy because you enjoy your job. That's like asking for an anvil to drop on your head. And it's no one's business if you HAVE to work or not. If women only worked because they HAD to, most of our teachers, doctors, nurses and a slew of other occupations would be men. Or we would have a terrible shortage in so many fields.
Dawn