What causes heart palpitations?

Have lots of you mamas had heart palpitations? I’m 15 weeks and I’ve had them on and off all day today, after a drank a gigantic frappe. I’ll never do that again lol. I’m not in any pain just that feeling in my chest when it happens then it goes away. It just feels like my heart skips a beat for a second. I didn’t know how common they were in pregnancy until reading up on it and seeing they can happen due to increased blood flow. I also read it’s common to have them the whole pregnancy. What did you do to help them?