My Dr said it was normal. It happened with me too. Id read all these articles about women being over heated and hot flashes. It could be 80 degrees and I'd be shivering. You should grow out of it once you get your second trimester
That's a good question. I was always cold in my first trimester but just ignored it. Sorry, I'm no help. :/
I have a thyroid problem and I had stopped taking my medicine when I found out I was pregnant but my doctor told me to get back on it and my chills stopped. It can be a number of things just bring it up to your doctor
To be safe why don't you get yourself checked for a UTI.
I'm not sure but I'm 32w3d & experiencing the same thing lately