Thanks everyone!
I had read somewhere that if given the inj. it could cause the blood to be pumped into the baby too fast because of the fast/strong contractions??? That is the main reason I was wondering as I obviously wouldnt want that, or the baby to miss out on the vital blood either.
Alan, I am intending to not take any drugs if at all possible for that very reason but good point! What about gas? does that still pass through the placenta? Do they wait for the pulsing to stop before giving the inj as I only want it if required and not just jabbed into me when the baby emerges without waiting to see if it is needed.