idk what going on with my baby . she's almost 3 weeks and been doing fine. now today super fussy…

idk what going on with my baby . she's almost 3 weeks and been doing fine. now today super fussy won't let me put her down for a second. I'm about to get her baby wrap so I can at least cook dinner. up until now she would be fine when I feed her , swaddle in blanket and put her down..but today she's not having it