I had an elevated body temperature since being about 8 weeks pregnant. I went from being the coldest person in the room to having about the same comfort zone, temperature wise, as other people. I used to take a cradigan with me to wear in air-conditioned places, but now i'd like to have a fan! It is in my 3rd trimester that I actually started getting occassional hot flashes where it is almost unbearable to tolerate heat. It may also be due to the fact that it is almost july and 90 to over 100 degrees outside. It was kind of embarrassing one time, because I was chatting with a supervisor that could potentially give me a promotion in the future and I started to have a hot flash. I could feel myself overheating, turning red, getting out of breath and my skin getting moist. I felt like a serious dork, but she has children and probably understands!
Oh, and in response to the person asking about symptoms of being 10 days pregnant .. I don't think it is possible, because you don't even have enough hormones to get a positive result on a pregnancy test at that point. If you have those symptoms, you should see the doctor. It could be that another condition is causing those symptoms, or you are mistaken and are further along in poregnancy than you believe.