Baby wakes up screaming!

There’s something weird and wrong. My 1 month old baby wakes up suddenly and starts screaming like if she had a nightmare or someone wants to hurt her!!

I hold her to me closely. She calms down instantly when she sees me.

What could happen to her?

I’m very sure that I feed her, change her diaper and burp her.

Is it possible that she had a nightmare!?

It happened for 6 times since yesterday and I’m very worried about her. Is it normal?