I dont understand...

So I’ve been feeling crappy for the last almost 2 weeks now. I’ve been throwing up (mostly at night) headaches, super exhausted and pelvic pain. Went to the hospital Tuesday night cause my pelvic was really hurting and the only thing the doctor found was a UTI. One app said I was suppose to start my period Monday & this app said yesterday (Thursday) but still haven’t started. So I took a clearblue digital pregnancy test this morning and it said not pregnant. So I’m not quite sure what’s going on, if I really am pregnant and it’s just too soon or it’s something else. Any thoughts!! Just tired of feeling like crap 😔 Wish I knew what was going on..at least having some answers would make me feel a little bit better!