Pregnancy test

Boo • 🌸💜
I've felt awful all day& decided to take another pregnancy test but it came out as negative... I took one on New Year's eve and it was also negative. Just wanna know why I feel so crappy if I'm not pregnant 😩😩 Maybe it's just too early to tell because I am irregular with my periods. 
I don't see another line, does anyone else???