Heart palpitations

Does anyone else experience these? It feels like and extra beat. I have had them since I had my second baby back in April 2015. Have had multiple tests done and worn monitors for 3 weeks and they came back as pvc’s/pac’s. I’m currently 9 weeks and 2 days pregnant with baby #3 and they have really ramped up and it is making me increasingly on edge. I’m so worried my heart is going to jsut stop or something. Has anyone else had this or has this? I’m kind of freaking out.