I'll be 31 in Nov., am pregnant with my second and also see a cardiologist. I have heart palpitations when my hormones fluctuate (no fainting but feeling faint). It's a problem I have with pregnancy or birth control pills (basically an ongoing issue for me). I felt like my ob was quick to send me to the cardiologist so I was in denial at first. After some coaxing I did go see the cardiologist. The cardiologist will do an EKG and a sonogram most likely. I've also worn a heart monitor for a month. Luckily the palpitations are benign so now they just monitor me with routine checkups. I should mention that they may recommend a magnesium supplement. Sometimes it can cause me to have diarrhea if I get too much magnesium between diet and supplement. The diarrhea is a symptom of overactive thyroid as you may already know. As a result, I was having symptoms of an overactive thyroid so my dr. tested last week (32 weeks prego) and it came back normal. I guess my other symptoms must be due to my anemia problem. The joys of pregnancy!