What Could Cause Small Blips Or Scribbles On My Apple Watch EKG During Chest Tightness When My Doctor Suspects PACs, PVCs, Or Tachycardia?

Hi, My cardiologist has been difficult to reach due to the pandemic and my situation is a little weird. I have a lot of medical problems but I have had many tests on my heart and lungs and I don’t have any serious problems with those. I know that what I’m experiencing is not a danger to my health. It has been happening for years. But I have an Apple Watch and I’m currently having symptoms of an tight or pulling sensation in my chest and I did the ekg and I noticed that there are little blips that look like a small scribble. I am curious to know what issue is causing this. My cardiologist asked me to send some of my results which I did but he hasn’t answered in awhile. As I said I have had every test imaginable and I know it’s not serious I’m just interested in understanding test results rather than just having the doctor say you have pac’s or pvc’s or tachycardia.