Body temp... Pregnant maybe?

Okay so my temp is at 99.5 all day and I'm super exhausted but I'm not sick and have no other sick like Symtoms...and I know because one I'm not easily sick and two I just got off antibiotics not long ago. And I've been having weird PMS Symtoms the last almost 2 weeks but I'm not due for my period for another almost 3 weeks. I took a test a week ago and it was negative. Any ideas ladies? Please anything is helpful.