Hives?! I will be 12 weeks pregnant tomorrow and today I broke out with hives all over my body. They…

Hives?!

I will be 12 weeks pregnant tomorrow and today I broke out with hives all over my body. They will appear for a few hours in one place and then disappear and new ones will appear in a different spot. I have them all over my legs, back, stomach and arms. Anyone else experience this and know what it is? Very itchy and annoying.