Cold under hot sun

Hi, I currently 9 weeks pregnant. Baby no.4. I've never felt like this during any of my other pregnancy. I'm feeling cold and shivering eventhough I'm out in the sun. Have anyone else went through the same thing? Im wearing long sleeve btw. The last time I feel like this was 10 years ago. And I blacked out after feeling cold and shivers.. I'm currently out with my 2 year old. Any on the spot remedies? #pleasehelp