Tinnitus: 2 seconds every month seems like a rare event to me. It's unlikely that ringing sound is fetal heartbeat. If worried, time rate of ringing sound. Fetal heart rate is 120-160 beats per minute or 2-3 beats per second. Check out http://www.mayoclinic.org/diseases-conditions/tinnitus/basics/definition/con-20021487 for more info.
Answered 10/27/2015
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