Unfortunately there is no definite time in which you lose your plug- I know there are women who go a large portion of their pregnancy losing plug (because it is capable of regeneration) where as some never see it at all..
With my first pregnancy I never saw my plug- just went into labor one night after one of my waters broke (twin pregnancy)
With my second pregnancy I lost my plug over a day- went into labor the next day..
sorry no help! But good luck hopefully its soon for you!
pp is right. i never noticed losing mine so my assumption is i lost it a little at a time. i probably dismissed it as just different thicker discharge (it was my first baby). i think i hva estarted lossing small bits of it now, and i am 34 weeks.