I have been having acute pelvic pain and when I press down on my pelvic area I can feel something but I'm not sure took a home test and it was negative Not sure what it could be?

PID? Appendicitis? Any unexplained pelvic or abdominal pain needs professional examination. If severe, or if fever or nausea, do it immediately; if your own doctor (or someone covering) can't see you today, go to urgent care or an ER. Many possible causes, including PID, a complication of STDs; appendicitis; others. Negative home test for urinary tract infection doesn't mean anything; this doesn't sound like UTI.