babys heartbeat

Has anyone gone in for a regular drs visit nd been told the heartbeat has an extra beat or drops a beat..something a long those lines. I am now gonna go back to a high risk dr to check it out. Dr did ask if i had coffee or soda that morning which i did not nd thats when she decided to send me to a high risk dr. I am 30 weeks and everything has been fine up to this point.