hives? plz respond

Tasha • Married to my high school sweetheart 💖 With two beautiful babies! 💖💙 Pregnant w/ #3 🥰
I'm almost 38 weeks pregnant & im getting hives, all I ate today was pasta & bread, than pancakes for lunch. And I only drank water? I was up in the mountains to visit my boyfriends grandma but that's it? What should I do, my fave is itchy & it burns, I feel sick.