HI welcome to health care magic.........
Its very common to feel that you have fever
and still the temperature is normal on thermometer.
Could be at times the thermometer is wrong , but majority of the times you may feel it but its not really there.
You can take a ceterizine
tabelet for cold
and wait for a day or two , keep checking temperature and if its high take tylenol
No need to worry for cold in pregnanacy.