I Have Every Sign Of Being Pregnant, Acid Reflux, Strong

I have every sign of being pregnant, acid reflux, strong sense of smell, horrible sore boobs, I spotted couple weeks ago, nauseous but not vomiting, back aches....
Couple days ago I started itching and it still started today on the back on my leg is pregnancy hives and on my hand and arms. I have to be pregnant but failed a at home pregnancy test of course, if not pregnant can you explain the hives