Over the years I have had the feeling of my heart flopping around in my chest every once in a great while. Lately they have greatly increased. Now it happens everyday. I had a long episode over the weekend (felt like flopping for around 10 seconds), so I started to keep track of how many times per day. Yesterday was five times and today has been two. I am a 34 year old female and am 10 weeks pregnant. I am not drinking any caffiene and dont smoke.