Fever and chills!

Jade
I rarely suffer from fevers, actually don't remember the last time I had one, but yesterday I all of a sudden had fever, body aches and chills. When I said all of a sudden I mean I was fine one hour and the next felt dizzy and like crap. I was burning up so I took some Tylenol as I was scared of fever getting too high and effecting the baby. I'm about 4 wks along but just as quick as it came with 5 hrs I had sweat it out and now feel fine. My first dr appt is not until December 1st but was wondering has this happened to anyone early on in pregnancy? I'm just praying baby is ok