When listening to my heart with a stethescope, my heartbeat sounded like, "woosh'dub, whoosh'dub." instead of normal "lubb'dubb" sound. why?

Murmur: Could be a murmur....Get an echocardiogram & talk to your physician (in opposite order) but in a young person may be a normal systolic flow murmur.

Cardiac murmur: What you're hearing is called a murmur. Essentially it is the sound made by turbulent blood flow. Turbulence may be caused by a narrowed valve, an overly thickened heart muscle, congenital defect or a valve that doesn't fully close and allows blood to travel in the opposite direction (leaky valve). An echocardiogram (ultrasound of the heart) is a great noninvasive way of determine the cause.