When you say Palpitations do you mean heart flutters/back beats, or do you mean a fast heartbeat?

I get both sometimes, the heart flutters were worrying me so my OB sent me to a Cardiologist just to ease my mind, everything turned out to be fine. He explained that during pregnancy the heart works double time to keep the extra blood pumping around, so when it feels like it 'misses' a beat it is actualy compensating for a fast beat so it pauses for a beat and the next beat hits you with a 'thump' which is the flutter/palpitation.
I hope this helps, I know how scary they can be.

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