sleep regression

Can my two and half week old have sleep regression? My baby for the last week or so has been resisting naps and waking up every half hour in the middle of the night, i’ll try feeding her, changing her, and just holding her or rocking her and she seems to be fussy no matter what i do. I haven’t changed anything with her schedule or routine at all, could it be sleep regression or an upset tummy? i’m not really sure what to do and my boyfriend is going back to work on monday so any tips would be helpful!