my advice? Fire on the weekend (Friday), and keep the ventillation system all weekend. Otherwise see if you can get the pieces fired somewhere else, (i.e. in your elementary school or other school in the neighborhood).
while you can't protect yourself from everything, it doesn't hurt to be prudent.
> From: firstname.lastname@example.org
> To: email@example.com
> Subject: [teacherartexchange] Ceramics and pregnancy
> Date: Wed, 30 Apr 2008 22:24:32 -0400
> I am writing to get your knowledge on clay dust, glaze, and firing
> during pregnancy.
> I have a bunch of clay pieces that I need to fire next week and I
> recently found out I have a bun in my oven.
> I researched on line and found that I should not be around when firing.
> Should I be concerned about the fumes, the glaze and the clay dust?
> The glaze I use is non toxic Amaco brand ( I know it is lead free, Is
> there other chemicals I need to be concerned about?)
> Will firing the kiln over night be all right or will the fumes linger
> in the AM as I unload the kiln? I do have a ventilation system, I
> assume it works properly and I have a great cross breeze when I open
> the door to the outside.
> This is my first child, and one we have been trying to have of over 2
> years, I don't not want to put my self or the baby at risk.
> I don't want to not fire the pieces and let the kids down either.
> Any advice is much appreciated.
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