Hi Celsie

You know I had the exact same thought when I was pregnant! I was too afraid to insert them because of that reason! So I just took them orally. I was scared if I inserted them and went into labour, my ob would freak out and say "oh my goodness! what HAVE you been putting up there??!!!!"
Anyway, my labour (first baby) only went for 6ish hrs so I think that even just taking it orally helped me...maybe...

All the best