Tooth sensitivity in 1st trimester?

I had my teeth cleaned in June and everything was fine. I have been noticing sensitivity off and on for the past 5 days. Can you get a filling in your first trimester? I will barely be 4 weeks when I make the appointment. I read some websites that say to wait until the second trimester, but others say it is fine because it is better to have it done than risk infection. It might not be a cavity, but ice water and chewy foods bother it. Anyone ever have anything like this?