18 weeks tomorrow. 3rd baby. I feel fine but Since yesterday, ive been getting the chills A LOT. Im talking like every 20 mins lasting about 2 secs. I know pregnancy causing temp fluctuations but idk if this often is normal? Its beginning to bother me because it wont stop. Should I be concerned, i feel that something isnt right and my body is reacting to a certain problem? :/ plz help ive unfortunately googled this and got bad reviews of course from infection to preeclampsia. Help anyone