Please refer to the answer below ...
Hi and thank you for asking to HCM!
You have nothing to worry about as long as basal ECG is normal. Your heart rate
is slightly above normal range (60-100 beats per minute) and it's called tachycardia
Tachycardia is a common finding in peoples with mitral valve prolaps, but without any clinical significance.
However I suggest running ECG holter monitoring to exclude other tachyarhythmias which may be not seen on basal ECG.
Hope this was of help!