I went for one of my two weeks doctors appointments today (I'm 33 weeks) and when they took my pulse it was 137 bpm. The doctor listened to my heart and lungs, checked for swelling, and said everything seemed not to be concerning but sent me to get blood work done to test my thyroid and said she might be sending me to a cardiologist if anything else comes up. Has this happened to anyon?. She said she's not too concerned about it because I don't have any other alarming symptoms. Just wondering what could cause this.