Like others said it is normal to loose parts of it throughout your pregnancy. Its only when you have your bloody show (you loose it and it has blood in it) that labor is close. I started loosing mine by 22 weeks. It kept regenerating and then coming out again for months. Then at 38 weeks I had my bloody show and went into labor that night.
It can regenerate itself so I wouldn't worry. As long as there is no blood then you should be fine.
I am a day further along than u are and last night I lost apart of mine and then again this morning I lost more. Last night when I saw it I thought I sneezed and didn't remember or something and just ignored it. Than this morning when I saw alot of it I called the docs. They told me not to worry as long as there was no blood, no intense contractions and there was no consistent time ib between little contractions. Im still paranoid becuz I didn't experience this with either of my other 2 kids... but she said it can happen for weeks before delivering.
I had the same thing just last week at 35 weeks, if there is no blood in it i have been told that your body can regenerate the mucus plug and sometimes labor can still be weeks away so unless you start to have contractions you don't need to call your doctor just mention it to them at your next appointment...unless you have a history of preterm labor then call your doctor.
and btw I am still not in labor and only having bh no contractions