Recently I did a filling on two of my teeth approximately 4 weeks ago. The problem is that one of the tooth which was filled only gets sensitive whenever i brush my teeth. Furthermore, when I eat or drink(cold stuff) it doesn't get sensitive. Also, if i were to place my finger where the filling took place and apply some pressure, I would feel a tingling sensation. This tingling sensation is felt right after I brush my teeth. Additionally, even though i apply pressure a couple of minutes after I brush my teeth. The sensation is gone, no matter how hard I apply pressure to it with my finger. Is it something I should be worried about? Or am I just overreacting.

NB: the tooth that has the filling only gets sensitive when I brush my teeth.

any advice would be appreciated, thanks in advance.