Baby suddenly EXTREMELY fussy?

Kelsey • Baby girl born 03/26/2019🎀💗

She’s been a fussy baby since birth but yesterday and today she’s had hour long crying spells that nothing I do helps.. she’s usually smiley a lot of the time but I’ve barely gotten any smiles. She’s fed, changed, body check, no fever. Has anyone gone through this? Growth spurt maybe? She’s 15 weeks tomorrow