It may be allergies. Look up pregnancy rhinitis. You can have allergies during pregnancy. I had it and had to take claritin and benadryl during my pregnancy. My throat itched I sneezed all the time its caused because of the extra hormones.
Hot water + lemon + honey + sugar does wonders
Warm some lemonade up in the microwave and put some honey in to it. Old trick but a good one. Helped me out when I had it x
Try hot tea with lemon and teaspoon of honey :)