What is this im feeling?

I am 7 weeks 6 days pregnant today and for the past couple weeks I have been having what feels like my heart skipping a beat, or jumping out of my chest for a second, it's like a weird flutter right in the middle of my chest and it only happens when I'm laying down. I know what heart palpitations are and I always have those when laying down where I can hear and feel my heart beating but this is different. It's really hard to explain but it's very unpleasant and im not sure if it's normal or something to worry about. I plan on brining it up to my Dr at my appt next week. Can anyone relate or know what this is?