3 week old

My baby had a rough night last night. She was fine all day. Ate and slept and poop/pee. But starting at 12-4 am she was not stop crying. She ate in between these times too. Finally around 4:30 she fell asleep in my arms until 7am. She’s had a couple days like this so far. Not many.... I’m looking for some advice. Some kind advice please!! I know she is a baby and she needs my love and that’s what I am doing. I held her all through the night but that didn’t help. I just need some mommy help or suggestions on what I can do to help her. I feel like a failure as a first time mommy and I need to be strong.