I am 22weeks pg and for a few weeks now have been noticing my heart really thumping, particularly at night when I go to bed. I know that the heart has to work harder during pgcy but don't remember having this when pg with dd. The books I have say that palpitations are normal but I can't find anything about thumping - heartbeat is regular btw but I am finding the thudding a bit disconcerting, especially when trying to sleep. Anyone else experienced this?