Well, its either... Allergies (tis cedar season!), a viral cold, or strep throat. You can take a little tylonal for the pain if its from allergies or a virus. However, I would not want to have strep throat if I was pregnant (although the internet says strep throat itself will not harm the baby but elevated fever/temperatures can) So, if it is a sever sore throat, plus if you feel a touch feverish or chilly, you might want to go in and get a throat culture just to be safe. I don't know if your OB does throat cultures; however if you go to your regular Dr (and it turns out positive) tell you OB because there are certain antibiotics to avoid and others that are safe.
Make sure you stay hydrated, which can be compromised if you don't feel like swallowing.
Here's a link that discusses dosages for tylonal while preggers: http://www.amazingpregnancy.com/pregnancy-articles/8.html
I hope you feel better!