Welcome to HCM,
You have mitral valve prolapse
,which can cause fast heart rate
, as you also suspect that you could be pregnant, first confirm that if negative then beta blocker
may be prescribed to you which will be very useful to you but only after consulting your Physician/Cardiologist.
It is also possible that you have little anxiety which can cause fast heart rate.
If you are pregnant then you have to consult your Gynecologist and take proper care.
Mitral valve prolapse is benign heart condition and does not require any specific treatment but certain precautions are required, like antibiotic prophylaxis
before any minor surgical procedures.
Please take folic acid
and vitamin supplements with advise from your doctor.