Doppler x2 beats

jill • I'm 28 in March expecting our 3rd baby in September I have been married 5 years and been together 10 years in September also we have 2 children already a 4 1/2 year old son and a 3 year old daughter
Heard my babys heart beat this morning low down to the left but then went to the right and heard heartbeat again could there be 2 babies or is the heart echoing across?