echocaerdiograms

I just had my third echo done,,I have mvp with mild regrurge,,My doctor is not concerned,,However,my question is  i had some thickening of the mitral and aortic valve,on last echo , now it is not seen,,How can that be?  My ejection fraction is good 71%,I reckon my question is are echos sometimes wrong and what is really there or say it is isnt?Also can my mild regur stay yhis way 4 ever without getting worse? And also,, can i exersise and carry on in a normal life?  thank you to all who respond

[CCF HeartMD5]

Mild mitral regurgitation means that a small amount of blood 'leaks' through the mitral valve back to the left atrium when the heart contracts. Mitral valve prolapse and mitral regurgitation are often found together on echocardiogram. In mitral valve prolapse, when the leaflets of the mitral valve close, they are displaced closer to the atrium. A prolapsed mitral valve leaflet may not leak at all, or may leak severely and result in sever mitral valve regurgitation. If you are having no symptoms, and the remainder of your echocardiogram is normal, there is no need to do anything about the small amount of mitral regurgitation seen on your most recent echo. You can certainly exercise and carry on a normal life. Regardless of the the echo finding, if you are not having any symptoms of shortness of breath or decreased exercise tolerance, then there is no need to do anything else about the mild mitral regurgitation. Please follow up with your doctor, while your mitral regurgitation may not get any worse over time, it is not possible to say for certain.