It's not all the time. Just once or twice a day and only last 5-15 mins. I know with my first baby I had an irregular heartbeat from being pregnant and the dr said it was fine so idk if I just got that back and I now noticed it or if it's something different.
You are probably having palpitations. .I get them from the hormone progesterone. .but If you are in pain.. go to ER
You should go to the ER don't wait till the 21st.