Uy, alam ko yan! Happened to me din during early pregnancy, parang gumagat ka ng lamig pero walang fever talaga, super weird feeling. I think it's just the hormones doing their thing at ang body mo na adjusting, kaya parang off ang temperature regulation mo even though technically normal ka pa. A few of us moms talked about it, and most felt better by second trimester, pero since 6 weeks ka pa lang, siguro best to mention it sa OB mo just to be safe and get her peace of mind din. In the meantime, layer up with light blankets lang para comfortable ka, at make sure you're hydrated and eating well!