What Tegan said, is perfect, I went drug free for the first one, then for the second all hell broke loose, i was in soooo much pain, and my pain tolerance is pretty high, in the end i asked for an epidural, as soon as he inserted it jaydens head popped out, i was so tense with pain that i could not dilate but as soon i was relaxed it was effortless, then they found out why i was in so much pain, he came out posterior, head up, which means his back was rubbing on my back.
Just goes to show you never know!!!! What i recommend is to be open minded,leave your birth plan open, Preferabley no drugs but if unbearable will consider it.
Third time round i am taking it as it comes!
You are a hero regardless whether you take drugs or not!!!
Goodluck