My 5 week old has been so fussy today, and I'm not sure why. She's been wanting to eat more often…

My 5 week old has been so fussy today, and I'm not sure why.

She's been wanting to eat more often this past week so I was thinking it could be a grow spurt?

She's happy when I offer her the breast which she takes, but I just wanna know what's wrong?:(

I'm a clueless first time mommy and any thoughts would be great.