PVC in pregnancy?

25 weeks pregnant and my doctor is referring me to a cardiologist! He said I am having a lot of extra heart beats so he is a little concerned! Yesterday I had a heart palpitation that made my heart feel like it was only beating every 2 or 3 seconds. I have 3 other kids so its getting a bit scary especially since I'm not doing anything to "set it off" usually I'm just sitting down! Is anyone else in the same boat?