First and foremost: Get to a doctor.
It may be nothing serious; I asked my doctor about a similar sound in my knee, and he assured me it was nothing to worry about, it's a common side effect of aging and has to do with reduced cartilage.
However, that was my doctor, after a thorough physical exam, and listening to the sound my knee made. Yours could be caused by something different. Stop the exercise, see a doc, and make sure everything's okay. Better safe than sorry!
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 186.4