Thanks for your help everyone!
I'll definitely be discussing it with my doctor at the next appointment- it just seemed a bit unnecessary. Not to mention that it's my body and I'd prefer to decide if a needle full of stuff gets whacked into it.
It's my strong preference that things be allowed to happen in their own time, and that intervention should come only when NEEDED- eg, if I'm about to bleed to death, stick me with as many needles as necessary to stop it!- so I shall write that down on my birth plan and make sure everyone has read it, including DH.
Thanks again!
Kirsten