I've had this too. I don't know how to describe it, it's annoying tooth pain (and not really PAIN so much as annoyance/sensitivity) that makes me what to grit my teeth. I do have pregnancy onset gingivitis but it seems more teeth than gums. What's really annoying is that I feel fine all day and after hours, when I would not be able to call the dentist, it starts hurting..then feels fine the next day! So annoying!
I am thinking it might just be the whole loosening bones/muscles thing. I do get scared because the hygienist told me that if I get an infection in the gums my baby could die. Isn't that just the nicest thing to say, and she said it like that too!
Using the waterpic helps mine feel better, and sometimes tylenol. Hopefully it's nothing major, knowing that others are dealing with it too makes me feel a little better!