sensitive teeth?

Fal
I had my last period 1/2 and I'm due again on 1/30-1/31. We have been BD everyday because I'm not 100% sure when I ovulate- 
I've had super bad cramps since 1/18 and 1/23 I tasted a small amount of blood from my gums randomly, today (1/25) I work up and my teeth are very sensitive- feels like I whitened them. 
Has this been a pregnancy sign for anyone?