Out of nowhere!!!!!! So confused!

Jessica
So Monday I went to the ER and found out that I have a raging uti and the pregnancy test came up negative af was due Monday do today makes five days late took a test this morning but it was also negative.when I woke up this morning I feel like the flu just hit me I've been nauseous and having horrible acid reflux. My temp was 97.5 so idk so confused.