@fify-- I completely understand, I've also been experiencing heart palpitations and I never had them before my pregnancy.
I've even been to the ER a couple of times because the palpitations got very bad. I though I might have a heart problem or maybe pregnancy related high blood pressure. But I was told that there is nothing wrong with me and that it's normal to have palpitations during pregnancy. They told me to take extra potassium, stay hydrated and rest. It's supposed to go away after some time.