Re: what is a "leak" in your heart?
An ekg is not a very good source to determine heart valve insufficiency. The vulve of interest is almost always the mital valve (opens to flow blood into the left ventricle to pumped into circulation). It not uncommon to have some leakage....I have moderate to severe mitral valve regurgitation (leakage causes a back flow of blood into the upper chamber rather into circulation.
For a more reliable source is an echocardiogram with doppler software. The test color codes the normal blood flow with red and any leakage another color so it is obvious to see. I saw mine.
If the condition becomes serious, there is the risk of an enlarged left chamber enlargement. Ane echo would also provide the diminsions of the heart chambers as well.
Also, many individuals have what is called mitral valve prolapse that is congenital and the problem is that the valve leaflets under pressure during pumping phase will billow into the upper chamber causing back flow. The condtion almost never progresses nor is there a medical problem associated woth MVP.
If your child bearing time increases the size of your left ventricle, that could be the underlying cause for any leakage...an enlarged left chamber skews the opening (orifice), and sometimes when the left ventricle returns to normal size the orifice remains somewhat deformed permitting a small leak.
I hope this provides some insight to your questions. Take care.