Thanks all so much for the info. I am pleased to say that it seems to have stopped for now, and there has been no wet leaking either. *knock on wood*
Alan, it is reassuring to know that the plug can reform, if that is what it was.... And I am going to hunt down my OB today and hopefully get a quick checkup JIC...
Anyway, for me, it is a big reminder that I am in the third tri now, and I need to slow down, and stop thinking I am invincible, and try to take things easy from here on it.